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 | |
|---|---|---|---|---|---|---|
|
AXON
3401
Axon Enterprise
AXON
$34.5B
| $586K | ﹤0.01% |
+1,046
| New | +$438K |
|
|
ABVX
3402
CALL
Abivax
ABVX
$8.45B
| $586K | ﹤0.01% |
4,400
+1,300
| +42% | +$147K |
|
3403
PUT
Dianthus Therapeutics
DNTH
$4.91B
| $585K | ﹤0.01% |
6,000
+4,700
| +362% | +$411K |
|
|
VLD
3404
CALL
DELISTED
Velo3D, Inc.
VLD
| $584K | ﹤0.01% |
33,300
+15,600
| +88% | +$274K |
|
3405
CALL
Corteva
CTVA
$51.9B
| $584K | ﹤0.01% |
6,900
-3,600
| -34% | -$289K |
|
3406
PUT
Sidus Space
SIDU
$203M
| $584K | ﹤0.01% |
207,700
+194,300
| +1,450% | +$745K |
|
3407
Liberty Global Class C
LBTYK
$3.11B
| $584K | ﹤0.01% |
53,049
+32,334
| +156% | +$374K |
|
3408
CALL
Host Hotels & Resorts
HST
$15.5B
| $583K | ﹤0.01% |
24,600
+6,600
| +37% | +$147K |
|
|
BTCI
3409
NEOS Bitcoin High Income ETF
BTCI
$1.38B
| $583K | ﹤0.01% |
21,709
+17,117
| +373% | +$573K |
|
3410
PUT
Cogent Communications
CCOI
$381M
| $583K | ﹤0.01% |
42,000
+21,600
| +106% | +$398K |
|
3411
Direxion Daily Gold Miners Index Bear 2X ETF
DUST
$108M
| $583K | ﹤0.01% |
9,169
-3,242
| -26% | -$168K |
|
3412
CALL
F5
FFIV
$24.7B
| $582K | ﹤0.01% |
1,400
-4,300
| -75% | -$1.53M |
|
3413
CALL
Group 1 Automotive
GPI
$2.89B
| $582K | ﹤0.01% |
2,000
-100
| -5% | -$32.8K |
|
3414
Penumbra
PEN
$12.6B
| $582K | ﹤0.01% |
1,843
-15,876
| -90% | -$5.14M |
|
3415
CALL
Box
BOX
$4.3B
| $581K | ﹤0.01% |
21,900
+17,600
| +409% | +$439K |
|
3416
Global X Cybersecurity ETF
BUG
$1.95B
| $581K | ﹤0.01% |
15,210
-154,872
| -91% | -$4.77M |
|
3417
ProShares UltraShort S&P500
SDS
$349M
| $581K | ﹤0.01% |
10,213
-486
| -5% | -$29.7K |
|
3418
PUT
Cheesecake Factory
CAKE
$5.23B
| $581K | ﹤0.01% |
7,300
-1,600
| -18% | -$104K |
|
|
NNDM
3419
CALL
Nano Dimension
NNDM
$329M
| $580K | ﹤0.01% |
400,200
+213,600
| +114% | +$349K |
|
|
JBTM
3420
PUT
JBT Marel
JBTM
$5.77B
| $580K | ﹤0.01% |
4,000
-100
| -2% | -$12.9K |
|
3421
iShares US Telecommunications ETF
IYZ
$1.07B
| $579K | ﹤0.01% |
13,696
+10,411
| +317% | +$442K |
|
3422
CALL
Voya Financial
VOYA
$8.7B
| $579K | ﹤0.01% |
6,400
+3,900
| +156% | +$318K |
|
3423
PUT
Diageo
DEO
$47.9B
| $579K | ﹤0.01% |
7,200
-43,800
| -86% | -$3.54M |
|
3424
CALL
Pegasystems
PEGA
$5.46B
| $578K | ﹤0.01% |
19,300
+16,100
| +503% | +$576K |
|
3425
CALL
MKS Inc
MKSI
$17.5B
| $578K | ﹤0.01% |
1,300
-5,900
| -82% | -$1.85M |
|
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.