Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares Russell 2000 ETF
IWM
|
+$146M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$108M |
| 3 |
Apple
AAPL
|
+$62.9M |
| 4 |
Tesla
TSLA
|
+$51.9M |
| 5 |
Micron Technology
MU
|
+$39.5M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$108M |
| 2 |
Meta Platforms (Facebook)
META
|
+$104M |
| 3 |
Advanced Micro Devices
AMD
|
+$92.1M |
| 4 |
Amazon
AMZN
|
+$90.3M |
| 5 |
TSMC
TSM
|
+$82.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.28% |
| 2 | Technology | 0.76% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.19% |
| 5 | Healthcare | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
8901
Schwab Fundamental US Large Company Index ETF
FNDX
$28.2B
| $684 | ﹤0.01% |
+22
| New | +$664 |
2026 Q2
0 quarters
|
|
8902
CALL
KKR Real Estate Finance Trust
KREF
$337M
| $684 | ﹤0.01% |
100
-100
| -50% | -$662 |
2026 Q1
1 quarter
|
|
8903
Invesco S&P MidCap Momentum ETF
XMMO
$6.52B
| $680 | ﹤0.01% |
+4
| New | +$652 |
2026 Q2
0 quarters
|
|
8904
CALL
Westport Fuel Systems
WPRT
$42.2M
| $677 | ﹤0.01% |
+300
| New | +$603 |
2026 Q2
0 quarters
|
|
|
BTF
8905
DELISTED
CoinShares Bitcoin and Ether ETF
BTF
| $671 | ﹤0.01% |
44
-225
| -84% | -$4.37K |
2025 Q4
2 quarters
|
|
8906
CALL
WhiteHorse Finance
WHF
$171M
| $670 | ﹤0.01% |
100
| – | – |
2025 Q4
2 quarters
|
|
8907
PUT
Oxford Square Capital
OXSQ
$140M
| $660 | ﹤0.01% |
500
+300
| +150% | +$480 |
2025 Q4
2 quarters
|
|
8908
PUT
Embecta
EMBC
$380M
| $652 | ﹤0.01% |
200
-9,800
| -98% | -$53.4K |
2022 Q4
14 quarters
|
|
8909
Brilliant Earth
BRLT
$25.5M
| $647 | ﹤0.01% |
+573
| New | +$730 |
2026 Q2
0 quarters
|
|
8910
CALL
Inogen
INGN
$188M
| $645 | ﹤0.01% |
+100
| New | +$662 |
2026 Q2
0 quarters
|
|
8911
Aware
AWRE
$18.9M
| $634 | ﹤0.01% |
+470
| New | +$626 |
2026 Q2
0 quarters
|
|
8912
CALL
Brandywine Realty Trust
BDN
$495M
| $634 | ﹤0.01% |
200
-9,600
| -98% | -$28.9K |
2024 Q2
8 quarters
|
|
8913
PUT
Largo
LGO
$46.7M
| $634 | ﹤0.01% |
1,000
+300
| +43% | +$309 |
2025 Q4
2 quarters
|
|
8914
PUT
eGain
EGAN
$149M
| $630 | ﹤0.01% |
+100
| New | +$733 |
2026 Q2
0 quarters
|
|
8915
Silvercrest Asset Management
SAMG
$79.2M
| $616 | ﹤0.01% |
61
-224
| -79% | -$2.73K |
2026 Q1
1 quarter
|
|
8916
T-REX 2X Inverse CRCL Daily Target ETF
CRCD
$3.76M
| $615 | ﹤0.01% |
+88
| New | +$414 |
2026 Q2
0 quarters
|
|
8917
PUT
Teads Holding Co
TEAD
$34M
| $613 | ﹤0.01% |
+800
| New | +$786 |
2026 Q2
0 quarters
|
|
8918
iShares Staked Ethereum Trust ETF
ETHB
$666M
| $609 | ﹤0.01% |
+30
| New | +$794 |
2026 Q2
0 quarters
|
|
8919
CALL
Rockwell Medical
RMTI
$28M
| $606 | ﹤0.01% |
110
| – | – |
2025 Q3
3 quarters
|
|
8920
DLH Holdings
DLHC
$54.6M
| $598 | ﹤0.01% |
+114
| New | +$648 |
2026 Q2
0 quarters
|
|
8921
CALL
Aimco
AIV
$237M
| $594 | ﹤0.01% |
+200
| New | +$766 |
2026 Q2
0 quarters
|
|
8922
PUT
Turkcell
TKC
$4.01B
| $588 | ﹤0.01% |
+100
| New | +$613 |
2026 Q2
0 quarters
|
|
8923
MaxCyte
MXCT
$144M
| $585 | ﹤0.01% |
476
-791
| -62% | -$788 |
2026 Q1
1 quarter
|
|
8924
PUT
RPC Inc
RES
$1.39B
| $583 | ﹤0.01% |
+100
| New | +$697 |
2026 Q2
0 quarters
|
|
8925
CALL
AudioEye
AEYE
$102M
| $581 | ﹤0.01% |
100
| – | – |
2023 Q4
10 quarters
|
|
Similar funds
Simplex Trading's Q2 2026 Portfolio in Review
As of Q2 2026, Simplex Trading held 10,638 positions worth $171B, up 14% from $149B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q2 2026 filing shows 1,714 new, 3,712 increased, 3,486 reduced and 1,487 closed positions. Its largest new stake was Micron Technology: 52,682 shares worth $60.8M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $108M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q2 2026 buy was Micron Technology: 52,682 shares worth $60.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q2 2026, an estimated $146M increase.
- Simplex Trading's biggest Q2 2026 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $108M.
- Simplex Trading fully exited Intel in Q2 2026, selling an estimated $76.6M.
- Simplex Trading's ten largest holdings make up 50% of its $171B portfolio in Q2 2026.
- Simplex Trading opened 1,714 new positions and closed 1,487 in Q2 2026.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $171B.
Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.