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 | |
|---|---|---|---|---|---|---|
2426
PUT
Unilever
UL
$135B
| $1.37M | ﹤0.01% |
24,700
-31,500
| -56% | -$1.82M |
|
2427
PUT
Silicon Motion
SIMO
$9.37B
| $1.37M | ﹤0.01% |
4,100
+4,000
| +4,000% | +$927K |
|
2428
Vanguard Total International Stock ETF
VXUS
$163B
| $1.37M | ﹤0.01% |
+15,969
| New | +$1.34M |
|
2429
PUT
Ashland
ASH
$3.16B
| $1.36M | ﹤0.01% |
20,700
+20,400
| +6,800% | +$1.18M |
|
2430
PUT
Onto Innovation
ONTO
$14.1B
| $1.36M | ﹤0.01% |
3,600
-800
| -18% | -$226K |
|
2431
Texas Roadhouse
TXRH
$10.5B
| $1.36M | ﹤0.01% |
+7,040
| New | +$1.2M |
|
2432
PUT
Hubbell
HUBB
$24.7B
| $1.36M | ﹤0.01% |
2,600
+2,500
| +2,500% | +$1.26M |
|
2433
PUT
Gulfport Energy Corp
GPOR
$2.73B
| $1.36M | ﹤0.01% |
8,000
+6,000
| +300% | +$1.08M |
|
2434
VICI Properties
VICI
$25.9B
| $1.35M | ﹤0.01% |
51,021
+34,578
| +210% | +$969K |
|
2435
Harley-Davidson
HOG
$2.65B
| $1.35M | ﹤0.01% |
55,363
-13,368
| -19% | -$321K |
|
|
TBCH
2436
CALL
Turtle Beach Corp
TBCH
$228M
| $1.35M | ﹤0.01% |
108,700
+103,700
| +2,074% | +$1.23M |
|
2437
Regal Rexnord
RRX
$10.4B
| $1.35M | ﹤0.01% |
5,681
+4,441
| +358% | +$928K |
|
|
WYFI
2438
PUT
WhiteFiber Inc
WYFI
$762M
| $1.35M | ﹤0.01% |
34,800
+30,500
| +709% | +$738K |
|
2439
PUT
Banco Bradesco
BBD
$36.1B
| $1.35M | ﹤0.01% |
389,500
+37,500
| +11% | +$137K |
|
2440
CALL
GoDaddy
GDDY
$12.3B
| $1.35M | ﹤0.01% |
15,900
+10,200
| +179% | +$861K |
|
|
SPYQ
2441
PUT
Tradr 2X Long SPY Quarterly ETF
SPYQ
$12.2M
| $1.35M | ﹤0.01% |
30,900
+13,400
| +77% | +$2.38M |
|
2442
CALL
Alpha Tau Medical
DRTS
$1.34B
| $1.35M | ﹤0.01% |
107,100
+58,500
| +120% | +$531K |
|
2443
TD Synnex
SNX
$20.8B
| $1.35M | ﹤0.01% |
5,036
+3,941
| +360% | +$949K |
|
2444
ProShares Trust UltraShort Lehman 20+ Year Treasury
TBT
$327M
| $1.35M | ﹤0.01% |
+38,527
| New | +$1.37M |
|
2445
PureCycle Technologies
PCT
$1.01B
| $1.34M | ﹤0.01% |
165,828
+85,184
| +106% | +$764K |
|
2446
PUT
Omeros
OMER
$1.45B
| $1.34M | ﹤0.01% |
141,400
+100,600
| +247% | +$1.2M |
|
2447
CALL
Global X S&P 500 Tail Risk ETF
XTR
$4.95M
| $1.34M | ﹤0.01% |
45,100
+19,900
| +79% | +$551K |
|
2448
Repligen
RGEN
$10.7B
| $1.34M | ﹤0.01% |
9,820
+8,917
| +987% | +$1.1M |
|
2449
Synchrony
SYF
$23.7B
| $1.34M | ﹤0.01% |
+17,609
| New | +$1.29M |
|
2450
PUT
Herbalife
HLF
$1.32B
| $1.34M | ﹤0.01% |
101,800
+33,700
| +49% | +$464K |
|
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.