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 | |
|---|---|---|---|---|---|---|
2551
CALL
Glacier Bancorp
GBCI
$5.83B
| $1.23M | ﹤0.01% |
23,800
-7,000
| -23% | -$337K |
|
2552
PUT
AutoNation
AN
$5.52B
| $1.23M | ﹤0.01% |
6,600
+6,400
| +3,200% | +$1.25M |
|
2553
CALL
abrdn Physical Silver Shares ETF
SIVR
$4.35B
| $1.23M | ﹤0.01% |
21,800
-27,200
| -56% | -$1.89M |
|
2554
CALL
Carbon Collective Climate Solutions US Equity ETF
CCSO
$45M
| $1.22M | ﹤0.01% |
98,100
-36,000
| -27% | -$1.01M |
|
2555
PUT
Algoma Steel
ASTL
$450M
| $1.22M | ﹤0.01% |
302,200
-2,200
| -0.7% | -$10.6K |
|
2556
PUT
Butterfly Network
BFLY
$2.5B
| $1.22M | ﹤0.01% |
145,300
+73,100
| +101% | +$378K |
|
2557
ATI
ATI
$25.3B
| $1.22M | ﹤0.01% |
+6,203
| New | +$1.05M |
|
2558
CALL
NOV
NOV
$7.08B
| $1.22M | ﹤0.01% |
65,900
+7,500
| +13% | +$149K |
|
|
2559
PUT
ATI
ATI
$25.3B
| $1.22M | ﹤0.01% |
6,200
-23,000
| -79% | -$3.9M |
|
2560
Modine Manufacturing
MOD
$10.5B
| $1.22M | ﹤0.01% |
4,568
-1,449
| -24% | -$382K |
|
2561
CALL
CorMedix
CRMD
$612M
| $1.22M | ﹤0.01% |
155,300
+43,300
| +39% | +$342K |
|
|
JMIA
2562
PUT
Jumia Technologies
JMIA
$919M
| $1.22M | ﹤0.01% |
172,800
+64,400
| +59% | +$458K |
|
2563
CALL
Coursera
COUR
$1.34B
| $1.22M | ﹤0.01% |
215,900
+24,000
| +13% | +$136K |
|
2564
PUT
Keurig Dr Pepper
KDP
$43.5B
| $1.22M | ﹤0.01% |
37,200
-34,300
| -48% | -$999K |
|
2565
PUT
Ecopetrol
EC
$34.1B
| $1.22M | ﹤0.01% |
85,500
+45,100
| +112% | +$653K |
|
2566
PUT
Nice
NICE
$6.61B
| $1.22M | ﹤0.01% |
13,400
-300
| -2% | -$29.1K |
|
2567
PUT
Paysafe
PSFE
$336M
| $1.22M | ﹤0.01% |
162,700
+161,500
| +13,458% | +$1.26M |
|
2568
Standex International
SXI
$3.44B
| $1.21M | ﹤0.01% |
3,396
+3,097
| +1,036% | +$866K |
|
2569
Rogers Corp
ROG
$2.46B
| $1.21M | ﹤0.01% |
7,416
+2,456
| +50% | +$338K |
|
2570
CALL
Magnachip Semiconductor
MX
$120M
| $1.21M | ﹤0.01% |
256,400
+250,700
| +4,398% | +$1.22M |
|
2571
Rigetti Computing
RGTI
$5.56B
| $1.21M | ﹤0.01% |
62,766
-206,075
| -77% | -$3.99M |
|
2572
Generac Holdings
GNRC
$12.3B
| $1.21M | ﹤0.01% |
+4,136
| New | +$1.04M |
|
2573
PUT
Antero Midstream
AM
$9.93B
| $1.21M | ﹤0.01% |
53,200
+24,100
| +83% | +$523K |
|
2574
PUT
ADT
ADT
$4.68B
| $1.21M | ﹤0.01% |
186,000
+95,100
| +105% | +$652K |
|
2575
CALL
Pacific Biosciences
PACB
$504M
| $1.21M | ﹤0.01% |
719,600
+653,400
| +987% | +$950K |
|
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.