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 | |
|---|---|---|---|---|---|---|
3301
Direxion Daily GOOGL Bull 2X ETF
GGLL
$1.01B
| $641K | ﹤0.01% |
5,640
+2,408
| +75% | +$288K |
|
3302
CALL
Smart Sand
SND
$223M
| $640K | ﹤0.01% |
127,700
-5,600
| -4% | -$28.1K |
|
3303
PUT
Morningstar
MORN
$7.19B
| $640K | ﹤0.01% |
+4,100
| New | +$713K |
|
3304
CALL
SharkNinja
SN
$25.6B
| $640K | ﹤0.01% |
4,200
+3,600
| +600% | +$431K |
|
3305
CALL
Insulet
PODD
$9.23B
| $639K | ﹤0.01% |
4,200
+4,000
| +2,000% | +$666K |
|
3306
PUT
Hamilton Lane
HLNE
$4.69B
| $639K | ﹤0.01% |
+8,100
| New | +$720K |
|
3307
CALL
Helmerich & Payne
HP
$3.74B
| $638K | ﹤0.01% |
19,500
+4,900
| +34% | +$183K |
|
|
GLIBK
3308
CALL
Liberty Capital Corp Series C GCI Group Common Stock
GLIBK
$931M
| $638K | ﹤0.01% |
29,600
+28,900
| +4,129% | +$812K |
|
3309
Domino's
DPZ
$9.67B
| $637K | ﹤0.01% |
2,153
+2,068
| +2,433% | +$681K |
|
3310
PUT
Collegium Pharmaceutical
COLL
$737M
| $637K | ﹤0.01% |
+17,600
| New | +$601K |
|
3311
PUT
Range Resources
RRC
$8.85B
| $636K | ﹤0.01% |
17,100
-4,400
| -20% | -$179K |
|
3312
PUT
Banc of California
BANC
$2.8B
| $635K | ﹤0.01% |
31,100
-53,700
| -63% | -$1.02M |
|
3313
Dave Inc
DAVE
$4.09B
| $635K | ﹤0.01% |
1,703
-8,182
| -83% | -$2.13M |
|
3314
CALL
Atlas Energy Solutions
AESI
$1.54B
| $635K | ﹤0.01% |
38,200
-2,600
| -6% | -$42.5K |
|
|
XXRP
3315
CALL
Teucrium 2x Long Daily XRP ETF
XXRP
$161M
| $634K | ﹤0.01% |
+30,800
| New | +$1.08M |
|
3316
CALL
Burlington
BURL
$16.7B
| $634K | ﹤0.01% |
2,000
+600
| +43% | +$193K |
|
3317
Astrana Health
ASTH
$1.74B
| $633K | ﹤0.01% |
13,648
+12,731
| +1,388% | +$458K |
|
3318
RH
RH
$2.31B
| $632K | ﹤0.01% |
+3,834
| New | +$528K |
|
3319
PUT
Sony
SONY
$136B
| $630K | ﹤0.01% |
35,200
-20,800
| -37% | -$438K |
|
3320
CALL
Five Below
FIVE
$12.6B
| $629K | ﹤0.01% |
3,500
-500
| -13% | -$108K |
|
3321
CALL
LendingTree
TREE
$340M
| $629K | ﹤0.01% |
14,200
-2,700
| -16% | -$109K |
|
3322
PUT
Pentair
PNR
$8.46B
| $629K | ﹤0.01% |
8,200
+8,100
| +8,100% | +$641K |
|
3323
PUT
Repligen
RGEN
$11B
| $628K | ﹤0.01% |
4,600
+2,400
| +109% | +$295K |
|
3324
PUT
Ocular Therapeutix
OCUL
$1.68B
| $627K | ﹤0.01% |
63,800
-42,700
| -40% | -$387K |
|
3325
Vornado Realty Trust
VNO
$6.37B
| $623K | ﹤0.01% |
15,855
-8,234
| -34% | -$266K |
|
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.