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 | |
|---|---|---|---|---|---|---|---|
6251
CALL
Geron
GERN
$745M
| $52.6K | ﹤0.01% |
41,100
+9,000
| +28% | +$12.7K |
2021 Q2
20 quarters
|
|
6252
MillerKnoll
MLKN
$1.44B
| $52.6K | ﹤0.01% |
2,571
+1,025
| +66% | +$16.4K |
2025 Q4
2 quarters
|
|
6253
Transportadora de Gas del Sur
TGS
$3.93B
| $52.6K | ﹤0.01% |
+1,768
| New | +$54.7K |
2026 Q2
0 quarters
|
|
6254
Abacus Global Management
ABX
$801M
| $52.5K | ﹤0.01% |
4,906
-18,500
| -79% | -$169K |
2024 Q4
6 quarters
|
|
6255
PUT
CS Disco
LAW
$323M
| $52.5K | ﹤0.01% |
13,900
-14,200
| -51% | -$55.1K |
2026 Q1
1 quarter
|
|
6256
Sprouts Farmers Market
SFM
$6.01B
| $52.5K | ﹤0.01% |
621
-8,650
| -93% | -$699K |
2026 Q1
1 quarter
|
|
6257
PUT
Electrovaya
ELVA
$260M
| $52.5K | ﹤0.01% |
5,000
+4,000
| +400% | +$39.6K |
2026 Q1
1 quarter
|
|
6258
PUT
Cato Corp
CATO
$47.6M
| $52.5K | ﹤0.01% |
16,200
-16,500
| -50% | -$50.3K |
2025 Q3
3 quarters
|
|
6259
PUT
Syndax Pharmaceuticals
SNDX
$1.19B
| $52.5K | ﹤0.01% |
2,400
-42,400
| -95% | -$882K |
2023 Q3
11 quarters
|
|
6260
Horizon Technology Finance
HRZN
$265M
| $52.4K | ﹤0.01% |
11,084
+4,153
| +60% | +$18K |
2024 Q3
7 quarters
|
|
6261
PUT
Mine Safety
MSA
$7B
| $52.4K | ﹤0.01% |
+300
| New | +$50.2K |
2026 Q2
0 quarters
|
|
6262
Datacentrex Inc
DTCX
$55.6M
| $52.3K | ﹤0.01% |
29,376
+29,223
| +19,100% | +$64.6K |
2025 Q3
3 quarters
|
|
6263
PUT
Cushman & Wakefield Ltd
CWK
$2.77B
| $52.2K | ﹤0.01% |
3,900
+2,100
| +117% | +$28.2K |
2026 Q1
1 quarter
|
|
6264
Pilgrim's Pride
PPC
$6.44B
| $52.2K | ﹤0.01% |
1,856
-2,939
| -61% | -$90.3K |
2026 Q1
1 quarter
|
|
6265
CALL
Roundhill Metaverse ETF
METV
$218M
| $52.1K | ﹤0.01% |
1,200
| – | – |
2022 Q4
14 quarters
|
|
6266
CubeSmart
CUBE
$9.09B
| $52K | ﹤0.01% |
+1,307
| New | +$52K |
2026 Q2
0 quarters
|
|
6267
CALL
Wrap Technologies
WRAP
$76M
| $51.7K | ﹤0.01% |
40,100
-2,800
| -7% | -$3.95K |
2020 Q1
25 quarters
|
|
6268
PUT
Clearfield
CLFD
$399M
| $51.7K | ﹤0.01% |
1,300
-2,300
| -64% | -$84.3K |
2025 Q4
2 quarters
|
|
6269
CALL
Fidelity Nasdaq Composite Index ETF
ONEQ
$10.8B
| $51.6K | ﹤0.01% |
500
+400
| +400% | +$39.8K |
2024 Q4
6 quarters
|
|
6270
Palomar
PLMR
$3.61B
| $51.4K | ﹤0.01% |
+407
| New | +$47.9K |
2026 Q2
0 quarters
|
|
6271
PUT
Twist Bioscience
TWST
$10B
| $51.4K | ﹤0.01% |
500
+200
| +67% | +$13K |
2020 Q3
23 quarters
|
|
6272
2x Solana ETF
SOLT
$165M
| $51.4K | ﹤0.01% |
1,594
+104
| +7% | +$4.38K |
2026 Q1
1 quarter
|
|
6273
CALL
Grayscale Solana Staking ETF
GSOL
$131M
| $51.4K | ﹤0.01% |
9,300
+9,000
| +3,000% | +$54.3K |
2026 Q1
1 quarter
|
|
6274
PUT
The RMR Group
RMR
$296M
| $51.3K | ﹤0.01% |
2,500
+1,800
| +257% | +$34.1K |
2025 Q3
3 quarters
|
|
6275
Neogen
NEOG
$2.7B
| $51.2K | ﹤0.01% |
5,692
-5,075
| -47% | -$46.6K |
2026 Q1
1 quarter
|
|
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.