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TLS Advisors LLC — 13F Holdings & Portfolio

CIK 1768824 · latest 13F-HR filed 2026-08-14

Backtest portfolio

TLS Advisors LLC manages $34.0M in 13F-reported U.S. long-equity assets across 17 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are EQT (21.23%), META (17.54%), RIO (13.96%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 1 new position and exited 0; 3 existing positions rose in reported value and 9 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.

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AUM
$34.0M

Long-equity book

Holdings
17

Distinct positions

Period
2026-06-30

Filed 2026-08-14

Q/Q Activity
+1 / −0 / ↑3 / ↓9

vs 2026-03-31

Portfolio charts

Latest quarter's book, what changed, and how the portfolio has evolved across filings.

Portfolio map

Q2 26
EQT21.2% · 0%META17.5% · 0%RIO14.0% · -32%PICK11.7% · -32%FISV7.2% · +4%XENE5.5% · 0%XOMA5.3% · -63%RRC5.2% · 0%VALE3.0% · -32%ALIT2.9% · 0%HOV1.6% · 0%OABI1.6% · -12%EWS1.2% · 0%IBIT1.1% · 0%BHP0.7% · -32%OVID0.1% · 0%BRLT0.0% · new

Box 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 value

Sectors from each company's SIC code; funds and ETFs grouped separately.

Biggest buys and sells

Q1 26 → Q2 26

Estimated 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

4 quarters

Total reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.

Top positions over time

reported value

The eight largest current positions, valued at each quarter end.

Concentration

top 10 = 93.6%

Cumulative share of the portfolio held in the largest N positions.

Firm Profile & Key People

As of the firm’s regulatory filing dated Oct 19, 2026.

Assets Under Management
$164.0M
Discretionary
$164.0M
Employees
10
Accounts
2
Address
100 NORTH BISCAYNE BOULEVARD
SUITE 1315
MIAMI, FL 33132
Phone
(844) 528-8430
Name Title / Status Ownership Type
FELDBERG, MARK ControlMANAGING MEMBER
since Dec 2016
10–25%Individual
LIDEL, JENNIFER, ANN ControlPRESIDENT
since Nov 2016
Less than 5%Individual
MARK FELDBERG SEPARATE PROPERTY TRUST, MARK FELDBERG TRUSTEE ControlTRUSTEE AND GRANTOR
since Dec 1988
50–75%Domestic Entity
MOECKLER, HARLAN, JAYTREASURER/CFO
since Nov 2016
Less than 5%Individual
REGAS, TERRY, JOHNCHIEF COMPLIANCE OFFICER
since Nov 2016
Less than 5%Individual
FELDBERG, MARK Control
Indirect owner via MARK FELDBERG SEPARATE PROPERTY TRUST, MARK FELDBERG TRUSTEE
TRUSTEE
since Dec 1988
75% or moreIndividual
Ownership & leadership changes · 2 filings with changes since Jan 3, 2017

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.

Jun 1, 2023 filing
  • AddedMOECKLER, HARLAN, JAY · TREASURER/CFO · Less than 5%
  • AddedREGAS, TERRY, JOHN · CHIEF COMPLIANCE OFFICER · Less than 5%
Mar 29, 2022 filing
  • AddedLIDEL, JENNIFER, ANN · PRESIDENT · Less than 5% · control person
Jan 3, 2017 filing (earliest on record)
  • ListedFELDBERG, MARK · TRUSTEE · 75% or more · indirect via MARK FELDBERG SEPARATE PROPERTY TRUST, MARK FELDBERG TRUSTEE · control person
  • ListedFELDBERG, MARK · MANAGING MEMBER · 10–25% · control person
  • ListedMARK FELDBERG SEPARATE PROPERTY TRUST, MARK FELDBERG TRUSTEE · TRUSTEE AND GRANTOR · 50–75% · 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)

Show all 3 →

Top Trims

Show all 9 →

New Positions

Show all 1 →

Exited Positions

  • No exits this quarter.
Show all 0 →

TLS Advisors LLC Holdings (2026-06-30)

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 EQT CORP EQT 26884L109 $7.2M 21.23% 135,800 SH
2 META PLATFORMS INC META 30303M102 $6.0M 17.54% 10,589 SH
3 RIO TINTO PLC RIO 767204100 $4.7M 13.96% 49,998 SH
4 ISHARES INC PICK 46434G848 $4.0M 11.73% 68,615 SH
5 FISERV INC FISV 337738108 $2.5M 7.21% 50,000 SH
6 XENON PHARMACEUTICALS INC XENE 98420N105 $1.9M 5.49% 30,956 SH
7 XOMA ROYALTY CORPORATION XOMA 98419J206 $1.8M 5.27% 42,165 SH
8 RANGE RES CORP RRC 75281A109 $1.8M 5.24% 47,923 SH
9 VALE S A VALE 91912E105 $1.0M 2.99% 67,528 SH
10 ALIGHT INC ALIT 01626W101 $985.9K 2.90% 1,760,462 SH
11 HOVNANIAN ENTERPRISES INC HOV 442487401 $551.4K 1.62% 3,872 SH
12 OMNIAB INC OABI 68218J103 $542.9K 1.60% 220,685 SH
13 ISHARES INC EWS 46434G780 $402.7K 1.18% 13,600 SH
14 ISHARES BITCOIN TRUST ETF IBIT 46438F101 $377.1K 1.11% 11,327 SH
15 BHP BILLITON LIMITED BHP 088606108 $252.4K 0.74% 3,030 SH
16 OVID THERAPEUTICS INC OVID 690469101 $50.7K 0.15% 18,858 SH
17 BRILLIANT EARTH GROUP INC BRLT 109504100 $12.7K 0.04% 11,222 SH
Filing History
Period Filed AUM Holdings Accession
2026-06-30 2026-08-14 $34.0M 17 0001768824-26-000006
2026-03-31 2026-05-13 $42.1M 16 0001768824-26-000004
2025-12-31 2026-02-04 $38.1M 16 0001768824-26-000002
2025-09-30 2025-11-04 $34.4M 19 0001768824-25-000015
Filer Information
Address
100 NORTH BISCAYNE BLVD
SUITE 1315
MIAMI, FL 33132
Phone
(312) 264-2196
Filing Manager
TLS Advisors LLC
MIAMI, FL
Signatory
Terry Regas
CCO