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 | |
|---|---|---|---|---|---|---|
276
CALL
Shell
SHEL
$273B
| $41.5M | 0.02% |
535,100
+13,600
| +3% | +$1.17M |
|
277
CALL
Mastercard
MA
$497B
| $41.4M | 0.02% |
80,600
+25,100
| +45% | +$12.5M |
|
278
CALL
Intuitive Surgical
ISRG
$143B
| $40.9M | 0.02% |
102,800
+47,800
| +87% | +$20.9M |
|
279
PUT
3M
MMM
$87.4B
| $40.7M | 0.02% |
251,300
+24,500
| +11% | +$3.71M |
|
280
CALL
Starbucks
SBUX
$108B
| $40.6M | 0.02% |
397,100
-251,400
| -39% | -$25.3M |
|
281
CALL
Target
TGT
$71.5B
| $40.2M | 0.02% |
307,800
-130,500
| -30% | -$16.6M |
|
|
282
State Street SPDR S&P 500 ETF Trust
SPY
$796B
| $39.9M | 0.02% |
53,496
-149,310
| -74% | -$108M |
|
283
PUT
Procter & Gamble
PG
$340B
| $39.7M | 0.02% |
270,500
-26,000
| -9% | -$3.78M |
|
284
CALL
JD.com
JD
$35.8B
| $39.5M | 0.02% |
1,550,900
-429,100
| -22% | -$12.6M |
|
285
Freeport-McMoran
FCX
$104B
| $39.4M | 0.02% |
626,805
+382,051
| +156% | +$24.6M |
|
|
CRCL
286
CALL
Circle Internet Group
CRCL
$22.6B
| $39.1M | 0.02% |
625,000
+7,500
| +1% | +$730K |
|
287
CALL
Lockheed Martin
LMT
$120B
| $39.1M | 0.02% |
76,800
-7,900
| -9% | -$4.27M |
|
288
CALL
MongoDB
MDB
$33.1B
| $38.6M | 0.02% |
114,800
+18,400
| +19% | +$5.52M |
|
|
BMNR
289
CALL
BitMine Immersion Technologies
BMNR
$16.6B
| $38.4M | 0.02% |
2,888,100
+876,200
| +44% | +$16.9M |
|
290
CALL
Adobe
ADBE
$93.6B
| $38.4M | 0.02% |
187,300
+5,100
| +3% | +$1.21M |
|
291
CALL
BP
BP
$114B
| $38.4M | 0.02% |
1,038,700
+78,200
| +8% | +$3.43M |
|
|
292
PUT
Target
TGT
$71.5B
| $38.3M | 0.02% |
293,600
+6,600
| +2% | +$839K |
|
293
PUT
Bristol-Myers Squibb
BMY
$128B
| $38.3M | 0.02% |
665,400
+251,000
| +61% | +$14.4M |
|
294
PUT
Comfort Systems
FIX
$58.4B
| $38.3M | 0.02% |
19,300
+16,100
| +503% | +$29.2M |
|
295
CALL
Petrobras
PBR
$131B
| $37.7M | 0.02% |
2,363,100
-395,800
| -14% | -$7.73M |
|
296
CALL
Carnival Corporation Ltd
CCL
$30.5B
| $37.6M | 0.02% |
1,314,600
-87,200
| -6% | -$2.38M |
|
297
CALL
lululemon athletica
LULU
$11.2B
| $37.4M | 0.02% |
327,600
+38,000
| +13% | +$5.08M |
|
298
CALL
Boston Scientific
BSX
$63.7B
| $37.3M | 0.02% |
873,200
+2,600
| +0.3% | +$141K |
|
299
KLA
KLAC
$245B
| $37.1M | 0.02% |
123,044
+118,454
| +2,581% | +$23.5M |
|
300
PUT
State Street SPDR Portfolio Short Term Treasury ETF
SPTS
$7.48B
| $37M | 0.02% |
251,800
-311,300
| -55% | -$9.04M |
|
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.