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 | |
|---|---|---|---|---|---|---|
6576
CALL
Silgan Holdings
SLGN
$4.35B
| $37.1K | ﹤0.01% |
800
+500
| +167% | +$20K |
|
|
MSBT
6577
PUT
Morgan Stanley Bitcoin Trust
MSBT
| $37.1K | ﹤0.01% |
+2,200
| New | +$45.4K |
|
6578
MarineMax
HZO
$1.15B
| $37.1K | ﹤0.01% |
1,012
-1,490
| -60% | -$47.9K |
|
6579
Appian
APPN
$2.75B
| $37K | ﹤0.01% |
+1,617
| New | +$36K |
|
6580
PUT
Cincinnati Financial
CINF
$26.3B
| $37K | ﹤0.01% |
200
-500
| -71% | -$82.9K |
|
6581
NB Bancorp
NBBK
$1.01B
| $37K | ﹤0.01% |
1,751
+874
| +100% | +$18K |
|
|
IREG
6582
PUT
Leverage Shares 2X Long IREN Daily ETF
IREG
$25.3M
| $36.9K | ﹤0.01% |
1,700
+1,400
| +467% | +$27.5K |
|
|
LADR
6583
CALL
Ladder Capital
LADR
$1.25B
| $36.8K | ﹤0.01% |
3,700
-21,600
| -85% | -$219K |
|
6584
Lufax Holding
LU
$1.08B
| $36.8K | ﹤0.01% |
27,871
-74,062
| -73% | -$126K |
|
6585
PUT
Danaos Corp
DAC
$2.83B
| $36.7K | ﹤0.01% |
300
-1,700
| -85% | -$212K |
|
6586
CALL
Brady Corp
BRC
$4.23B
| $36.6K | ﹤0.01% |
400
+300
| +300% | +$24.9K |
|
6587
PUT
OptimizeRx
OPRX
$148M
| $36.6K | ﹤0.01% |
6,400
+1,600
| +33% | +$9.2K |
|
6588
PUT
Apogee Enterprises
APOG
$834M
| $36.6K | ﹤0.01% |
800
+200
| +33% | +$7.47K |
|
6589
CALL
American Healthcare REIT
AHR
$11.9B
| $36.5K | ﹤0.01% |
+700
| New | +$34.4K |
|
6590
Tootsie Roll Industries
TR
$2.91B
| $36.5K | ﹤0.01% |
+922
| New | +$37.3K |
|
|
ASA
6591
CALL
ASA Gold and Precious Metals
ASA
$1.19B
| $36.4K | ﹤0.01% |
700
+300
| +75% | +$18.8K |
|
6592
CALL
Fidelity Corporate Bond ETF
FCOR
$355M
| $36.4K | ﹤0.01% |
+800
| New | +$37.8K |
|
6593
PUT
Inter&Co
INTR
$2.5B
| $36.4K | ﹤0.01% |
6,700
+6,600
| +6,600% | +$44.4K |
|
|
FSOL
6594
CALL
Fidelity Solana Fund
FSOL
$133M
| $36.4K | ﹤0.01% |
+4,200
| New | +$40K |
|
6595
CALL
Acumen Pharmaceuticals
ABOS
$230M
| $36.3K | ﹤0.01% |
13,600
-11,100
| -45% | -$27.4K |
|
6596
CALL
UFP Industries
UFPI
$4.65B
| $36.3K | ﹤0.01% |
400
| – | – |
|
6597
Seres Therapeutics
MCRB
$57.5M
| $36.3K | ﹤0.01% |
4,598
+1,528
| +50% | +$11.6K |
|
6598
CALL
Byrna Technologies
BYRN
$86.1M
| $36.2K | ﹤0.01% |
5,400
-900
| -14% | -$5.53K |
|
6599
PUT
Energy Recovery
ERII
$389M
| $36.1K | ﹤0.01% |
4,000
+3,400
| +567% | +$32.3K |
|
6600
CALL
Gibraltar Industries
ROCK
$1.4B
| $36.1K | ﹤0.01% |
800
+100
| +14% | +$3.92K |
|
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.