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 | |
|---|---|---|---|---|---|---|
1526
CALL
Ionis Pharmaceuticals
IONS
$7.4B
| $3.39M | ﹤0.01% |
42,700
+20,400
| +91% | +$1.54M |
|
1527
Vanguard Information Technology ETF
VGT
$155B
| $3.38M | ﹤0.01% |
+28,287
| New | +$3.1M |
|
1528
CALL
Critical Metals Corp
CRML
$1.15B
| $3.38M | ﹤0.01% |
329,400
-6,400
| -2% | -$68.5K |
|
1529
CALL
State Street SPDR Portfolio Europe ETF
SPEU
$712M
| $3.37M | ﹤0.01% |
49,300
-21,100
| -30% | -$1.15M |
|
1530
CALL
Sarepta Therapeutics
SRPT
$1.97B
| $3.37M | ﹤0.01% |
187,300
-85,400
| -31% | -$1.62M |
|
1531
Advance Auto Parts
AAP
$2.52B
| $3.36M | ﹤0.01% |
54,075
-14,953
| -22% | -$849K |
|
1532
PUT
Icahn Enterprises
IEP
$4.95B
| $3.35M | ﹤0.01% |
465,300
+247,400
| +114% | +$1.9M |
|
1533
PUT
Argan
AGX
$5.11B
| $3.35M | ﹤0.01% |
4,200
-600
| -13% | -$399K |
|
1534
CALL
Genius Sports
GENI
$1.72B
| $3.35M | ﹤0.01% |
553,200
+492,800
| +816% | +$2.55M |
|
1535
CALL
Ashland
ASH
$3.16B
| $3.35M | ﹤0.01% |
+50,800
| New | +$2.95M |
|
1536
Rocket Lab Corp
RKLB
$47.3B
| $3.34M | ﹤0.01% |
32,873
+31,718
| +2,746% | +$3.16M |
|
|
TYNS
1537
PUT
DELISTED
Direxion Daily 7-10 Year Treasury Bear 1X Shares
TYNS
| $3.34M | ﹤0.01% |
22,700
-10,200
| -31% | -$1.5M |
|
1538
Tower Semiconductor
TSEM
$26.1B
| $3.34M | ﹤0.01% |
12,809
+4,867
| +61% | +$1.17M |
|
1539
CALL
A10 Networks
ATEN
$1.87B
| $3.34M | ﹤0.01% |
89,300
+89,200
| +89,200% | +$2.59M |
|
1540
CALL
Red Cat Holdings
RCAT
$1.02B
| $3.32M | ﹤0.01% |
312,200
+51,400
| +20% | +$592K |
|
1541
CALL
Gildan
GIL
$7.59B
| $3.32M | ﹤0.01% |
64,400
-500
| -0.8% | -$28.7K |
|
1542
PUT
Vail Resorts
MTN
$4.85B
| $3.32M | ﹤0.01% |
24,400
-61,400
| -72% | -$7.99M |
|
1543
PUT
Entergy
ETR
$47.1B
| $3.32M | ﹤0.01% |
28,900
-18,000
| -38% | -$2.03M |
|
|
HIMX
1544
CALL
Himax Technologies
HIMX
$2.52B
| $3.31M | ﹤0.01% |
215,800
+81,900
| +61% | +$1.27M |
|
1545
PUT
Liquidia Corp
LQDA
$6.13B
| $3.31M | ﹤0.01% |
41,500
-40,000
| -49% | -$2.14M |
|
1546
PUT
Revolution Medicines
RVMD
$43.9B
| $3.3M | ﹤0.01% |
17,600
-34,900
| -66% | -$5.1M |
|
1547
PUT
ZIM Integrated Shipping Services
ZIM
$3.52B
| $3.29M | ﹤0.01% |
126,700
+17,800
| +16% | +$459K |
|
1548
PUT
Tenet Healthcare
THC
$20.9B
| $3.29M | ﹤0.01% |
17,600
+15,000
| +577% | +$2.76M |
|
1549
CALL
Lamb Weston
LW
$5.99B
| $3.29M | ﹤0.01% |
76,200
+53,500
| +236% | +$2.31M |
|
|
PMT
1550
PUT
PennyMac Mortgage Investment
PMT
$726M
| $3.29M | ﹤0.01% |
291,500
+49,400
| +20% | +$544K |
|
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.