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 | |
|---|---|---|---|---|---|---|
351
PUT
Fortinet
FTNT
$127B
| $30.6M | 0.02% |
198,900
+30,100
| +18% | +$3.48M |
|
352
PUT
Merck
MRK
$367B
| $30.5M | 0.02% |
237,600
-177,900
| -43% | -$20.8M |
|
353
PUT
Credo Technology Group
CRDO
$39.7B
| $30.3M | 0.02% |
111,600
-56,300
| -34% | -$11.1M |
|
354
PUT
Nokia
NOK
$58.2B
| $30.3M | 0.02% |
2,278,600
+1,607,400
| +239% | +$20.7M |
|
355
PUT
Walt Disney
DIS
$183B
| $30.2M | 0.02% |
313,900
-176,900
| -36% | -$18M |
|
|
OKLO
356
CALL
Oklo
OKLO
$7.08B
| $30.1M | 0.02% |
575,400
+222,800
| +63% | +$13.9M |
|
357
CALL
Airbnb
ABNB
$92.8B
| $30M | 0.02% |
209,500
-63,600
| -23% | -$8.68M |
|
358
PUT
Hims & Hers Health
HIMS
$6.86B
| $29.9M | 0.02% |
863,400
+258,400
| +43% | +$6.94M |
|
359
PUT
PepsiCo
PEP
$176B
| $29.5M | 0.02% |
217,700
-259,100
| -54% | -$38.7M |
|
360
CALL
Core Scientific
CORZ
$5.57B
| $29.3M | 0.02% |
1,144,500
-842,200
| -42% | -$19.8M |
|
361
PUT
CVS Health
CVS
$114B
| $29M | 0.02% |
280,300
-149,300
| -35% | -$13.3M |
|
|
ETHA
362
CALL
iShares Ethereum Trust ETF
ETHA
$9.5B
| $29M | 0.02% |
2,437,900
-306,100
| -11% | -$4.75M |
|
363
ServiceNow
NOW
$140B
| $29M | 0.02% |
291,808
+195,170
| +202% | +$19.3M |
|
364
CALL
Hewlett Packard
HPE
$83.6B
| $29M | 0.02% |
641,800
+16,400
| +3% | +$592K |
|
|
B
365
CALL
Barrick Mining
B
$70.6B
| $28.9M | 0.02% |
787,200
-129,000
| -14% | -$5.29M |
|
366
PUT
Analog Devices
ADI
$191B
| $28.9M | 0.02% |
72,700
-8,100
| -10% | -$3.21M |
|
367
PUT
lululemon athletica
LULU
$11.2B
| $28.9M | 0.02% |
252,700
-83,500
| -25% | -$11.2M |
|
368
CALL
Listed Funds Trust Roundhill Magnificent Seven ETF
MAGS
$4.81B
| $28.8M | 0.02% |
448,600
+344,900
| +333% | +$22.8M |
|
369
CALL
T-Mobile US
TMUS
$177B
| $28.8M | 0.02% |
171,600
+87,100
| +103% | +$16.5M |
|
370
CALL
Gilead Sciences
GILD
$187B
| $28.7M | 0.02% |
227,500
-96,400
| -30% | -$12.7M |
|
|
371
CALL
Credo Technology Group
CRDO
$39.7B
| $28.6M | 0.02% |
105,100
-29,100
| -22% | -$5.75M |
|
372
PUT
Baidu
BIDU
$29.8B
| $28.5M | 0.02% |
249,400
-8,500
| -3% | -$1.05M |
|
|
373
PUT
Hewlett Packard
HPE
$83.6B
| $28.4M | 0.02% |
629,800
+135,900
| +28% | +$4.91M |
|
374
CALL
Amphenol
APH
$207B
| $28.4M | 0.02% |
321,600
-17,200
| -5% | -$1.24M |
|
375
Marvell Technology
MRVL
$235B
| $28.2M | 0.02% |
94,668
+54,978
| +139% | +$11M |
|
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.