TANAKA CAPITAL MANAGEMENT INC — 13F Holdings & Portfolio
CIK 816788 · latest 13F-HR filed 2026-05-18
TANAKA CAPITAL MANAGEMENT INC manages $59.9M in 13F-reported U.S. long-equity assets across 44 reported positions as of its 2026-03-31 13F-HR filing. Its largest disclosed positions are UAMY (8.98%), NXE (8.51%), CORT (7.46%). Quarter over quarter (versus its 2025-12-31 filing) the fund opened 0 new positions and exited 1; 17 existing positions rose in reported value and 13 fell.
AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.
Long-equity book
Distinct positions
Filed 2026-05-18
vs 2025-12-31
Portfolio charts
Latest quarter's book, what changed, and how the portfolio has evolved across filings.
Portfolio map
Q1 26Box size = position value; colour = change in share count vs the prior quarter (green added, red trimmed, blue new). Rows split across managers or share classes are combined. Click a box for the stock.
Sector mix
% of 13F valueSectors from each company's SIC code; funds and ETFs grouped separately.
Biggest buys and sells
Q4 25 → Q1 26Estimated from the change in shares held × the quarter-end price, so price moves alone don't count as buying. New and exited positions are included.
13F assets and positions
3 quartersTotal reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.
Top positions over time
reported valueThe eight largest current positions, valued at each quarter end.
Concentration
top 10 = 64.6%Cumulative share of the portfolio held in the largest N positions.
As of the firm’s regulatory filing dated Jul 17, 2026.
| Name | Title / Status | Ownership | Type |
|---|---|---|---|
| TANAKA, GRAHAM, YOSHIO Control | PRESIDENT AND DIRECTOR since Dec 1986 | 75% or more | Individual |
| BRATT, BENJAMIN MACDONALD | CHIEF COMPLIANCE OFFICER since Jun 2015 | 10–25% | Individual |
Ownership & leadership changes · 4 filings with changes since Mar 29, 2012
From the firm’s regulatory filings, newest first. Dates are filing dates: a filing that no longer lists someone does not say when they left.
- ChangedBRATT, BENJAMIN MACDONALD · ownership 5–10% → 10–25%
- ChangedBRATT, BENJAMIN MACDONALD · ownership Less than 5% → 5–10%
- No longer listedQUINLIN, MAX DANSON · CHIEF COMPLIANCE OFFICER · Less than 5% · listed since Apr 2013
- AddedBRATT, BENJAMIN MACDONALD · CHIEF COMPLIANCE OFFICER · Less than 5%
- AddedQUINLIN, MAX DANSON · CHIEF COMPLIANCE OFFICER · Less than 5%
- ChangedTANAKA, GRAHAM, YOSHIO · title PRESIDENT, DIRECTOR AND CHIEF COMPLIANCE OFFICER → PRESIDENT AND DIRECTOR
- ListedTANAKA, GRAHAM, YOSHIO · PRESIDENT, DIRECTOR AND CHIEF COMPLIANCE OFFICER · 75% or more · control person
Quarter-over-quarter changes
Changes in reported position value vs the prior 13F, so price moves count too, not just shares bought or sold.
Top Adds (vs prior quarter)
- United States Antimony$2.3M +73.9%
- Intellia Therapeutics$2.0M +227.9%
- Aura Minerals, Inc.$1.8M +80.8%
- NexGen Energy$1.0M +25.1%
- Cameco$843.0K +56.2%
Top Trims
- Nuvation Bio Inc.-$3.7M -48.7%
- Philip Morris International-$545.0K -53.6%
- The Carlyle Group-$309.0K -18.2%
- Nvidia-$305.0K -6.6%
- Symbotic-$287.0K -11.1%
TANAKA CAPITAL MANAGEMENT INC Holdings (2026-03-31)
Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).
| # | Issuer | Symbol | CUSIP | Value | Weight | Shares | Type |
|---|---|---|---|---|---|---|---|
| 1 | United States Antimony | UAMY | 911549103 | $5.4M | 8.98% | 615,975 | SH |
| 2 | NexGen Energy | NXE | 65340P106 | $5.1M | 8.51% | 439,205 | SH |
| 3 | Corcept Therapeutics | CORT | 218352102 | $4.5M | 7.46% | 110,854 | SH |
| 4 | Nvidia | NVDA | 67066G104 | $4.3M | 7.22% | 24,780 | SH |
| 5 | Aura Minerals, Inc. | — | G06973104 | $4.1M | 6.82% | 50,085 | SH |
| 6 | Nuvation Bio Inc. | NUVB | 67080N101 | $3.9M | 6.46% | 901,825 | SH |
| 7 | Apple Computing | AAPL | 037833100 | $3.3M | 5.45% | 12,859 | SH |
| 8 | Intellia Therapeutics | IJR | 464287804 | $2.8M | 4.71% | 220,107 | SH |
| 9 | Catalyst Pharmaceuticals | CPRX | 14888U101 | $2.8M | 4.69% | 113,418 | SH |
| 10 | Onto Innovation | ONTO | 683344105 | $2.6M | 4.26% | 12,448 | SH |
| 11 | Applied Materials | AMAT | 038222105 | $2.4M | 3.97% | 6,953 | SH |
| 12 | Cameco | CCJ | 13321L108 | $2.3M | 3.91% | 21,575 | SH |
| 13 | Symbotic | SYM | 87151X101 | $2.3M | 3.83% | 43,094 | SH |
| 14 | AFLAC Inc. | AFL | 001055102 | $2.2M | 3.67% | 20,039 | SH |
| 15 | Electrovaya | ELVA | 28617B606 | $2.0M | 3.32% | 253,930 | SH |
| 16 | Stifel Financial Corp. | SF | 860630102 | $1.4M | 2.36% | 19,090 | SH |
| 17 | The Carlyle Group | CG | 14309L102 | $1.4M | 2.33% | 28,791 | SH |
| 18 | Amazon.com Inc. | AMZN | 023135106 | $1.3M | 2.10% | 6,052 | SH |
| 19 | QUALCOMM | QCOM | 747525103 | $1.2M | 1.96% | 9,104 | SH |
| 20 | PepsiCo, Inc. | PEP | 713448108 | $1.1M | 1.84% | 7,095 | SH |
| 21 | Uranium Energy Corp. | UEC | 916896103 | $1.0M | 1.73% | 77,051 | SH |
| 22 | Mastercard | MA | 57636Q104 | $946.0K | 1.58% | 1,893 | SH |
| 23 | Philip Morris International | PM | 718172109 | $471.0K | 0.79% | 2,851 | SH |
| 24 | Meta Platforms | META | 30303M102 | $459.0K | 0.77% | 803 | SH |
| 25 | ASML Holding N V ADR | ASML | N07059111 | $296.0K | 0.49% | 224 | SH |
| 26 | Accenture plc | ACN | G1151C101 | $100.0K | 0.17% | 502 | SH |
| 27 | iShares Russell 1000 | IWB | 464287622 | $84.0K | 0.14% | 235 | SH |
| 28 | iShares Russell 1000 Growth | IWF | 464287614 | $64.0K | 0.11% | 149 | SH |
| 29 | JPMorgan Chase and Co. | JPM | 46625H100 | $55.0K | 0.09% | 188 | SH |
| 30 | BeyondSpring Inc | BYSI | G10830100 | $43.0K | 0.07% | 26,296 | SH |
| 31 | iShares Russell 1000 Value | IWD | 464287598 | $26.0K | 0.04% | 123 | SH |
| 32 | Colgate-Palmolive Co. | CL | 194162103 | $22.0K | 0.04% | 263 | SH |
| 33 | iShares Core SP Small Cap | IJR | 464287804 | $14.0K | 0.02% | 109 | SH |
| 34 | Mondelez International, Inc. | MDLZ | 609207105 | $11.0K | 0.02% | 192 | SH |
| 35 | Bristol-Myers Squibb | BMY | 110122108 | $10.0K | 0.02% | 166 | SH |
| 36 | iShares MSCI EAFE | EFA | 464287465 | $10.0K | 0.02% | 103 | SH |
| 37 | iShares MSCI EAFE Growth | EFG | 464288885 | $9.0K | 0.02% | 81 | SH |
| 38 | Procter And Gamble | PG | 742718109 | $9.0K | 0.02% | 63 | SH |
| 39 | Intel Corp. | INTC | 458140100 | $8.0K | 0.01% | 180 | SH |
| 40 | Kraft Heinz Company | KHC | 50076Q106 | $6.0K | 0.01% | 279 | SH |
| 41 | Church and Dwight Co. Inc. | CHD | 171340102 | $2.0K | 0.00% | 26 | SH |
| 42 | Johnson and Johnson | JNJ | 478160104 | $2.0K | 0.00% | 9 | SH |
| 43 | Travelers Group | TRV | 89417E109 | $2.0K | 0.00% | 6 | SH |
| 44 | Fuelnation, Inc. | FLNA | 359528205 | $0 | 0.00% | 251,150 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-03-31 | 2026-05-18 | $59.9M | 44 | 0000816788-26-000002 |
| 2025-12-31 | 2026-02-17 | $54.8M | 45 | 0000816788-26-000001 |
| 2025-09-30 | 2025-11-14 | $55.5M | 45 | 0000816788-25-000005 |