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 |
NVIDIA
NVDA
|
+$172M |
| 2 |
Apple
AAPL
|
+$156M |
| 3 |
Broadcom
AVGO
|
+$101M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$57.2M |
| 5 |
UnitedHealth
UNH
|
+$55.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$140M |
| 2 |
Amazon
AMZN
|
+$47.9M |
| 3 |
Netflix
NFLX
|
+$38.3M |
| 4 |
TSMC
TSM
|
+$37.3M |
| 5 |
Pfizer
PFE
|
+$36.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.27% |
| 2 | Technology | 0.74% |
| 3 | Communication Services | 0.19% |
| 4 | Consumer Discretionary | 0.18% |
| 5 | Healthcare | 0.17% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
451
CALL
Futu Holdings
FUTU
$17.1B
| $27.5M | 0.02% |
222,300
+33,600
| +18% | +$3.44M |
|
452
PUT
ON Semiconductor
ON
$29B
| $27.4M | 0.02% |
522,200
+123,500
| +31% | +$5.37M |
|
453
CALL
W.W. Grainger
GWW
$62.4B
| $27.3M | 0.02% |
26,200
-21,200
| -45% | -$22M |
|
454
PUT
Dick's Sporting Goods
DKS
$12.4B
| $27.2M | 0.02% |
137,400
+79,800
| +139% | +$14.8M |
|
|
AXON
455
CALL
Axon Enterprise
AXON
$41.9B
| $27.1M | 0.02% |
32,700
-1,700
| -5% | -$1.16M |
|
|
IPFF
456
CALL
DELISTED
iShares International Preferred Stock ETF
IPFF
| $26.8M | 0.02% |
434,500
-53,500
| -11% | -$3.3M |
|
457
PUT
Accenture
ACN
$114B
| $26.8M | 0.02% |
89,500
+6,200
| +7% | +$1.89M |
|
|
TEM
458
PUT
Tempus AI
TEM
$11.7B
| $26.6M | 0.02% |
419,200
+204,200
| +95% | +$11.7M |
|
459
PUT
Lyft
LYFT
$6.33B
| $26.6M | 0.02% |
1,689,300
+217,300
| +15% | +$3.04M |
|
460
CALL
Moderna
MRNA
$58.1B
| $26.6M | 0.02% |
964,200
-262,600
| -21% | -$6.92M |
|
461
CALL
Crown Castle
CCI
$32.3B
| $26.5M | 0.02% |
258,400
-99,200
| -28% | -$10M |
|
462
PUT
Abbott
ABT
$187B
| $26.4M | 0.02% |
194,000
+5,600
| +3% | +$738K |
|
463
CALL
Vale
VALE
$65B
| $26.4M | 0.02% |
2,714,300
+85,900
| +3% | +$809K |
|
464
PUT
Agnico Eagle Mines
AEM
$104B
| $26.4M | 0.02% |
221,600
+32,000
| +17% | +$3.71M |
|
465
CALL
Chewy
CHWY
$9.69B
| $26.2M | 0.02% |
615,700
-92,100
| -13% | -$3.67M |
|
466
SPDR Gold Trust
GLD
$150B
| $26.2M | 0.02% |
+85,931
| New | +$26M |
|
467
CALL
Western Digital
WDC
$169B
| $26.2M | 0.02% |
490,100
-490,900
| -50% | -$23.4M |
|
468
PUT
Quantum Computing Inc
QUBT
$1.81B
| $26.2M | 0.02% |
1,364,200
+557,800
| +69% | +$6.15M |
|
469
CALL
Deere & Co
DE
$187B
| $26.1M | 0.02% |
51,400
-22,900
| -31% | -$11.2M |
|
470
PUT
Wynn Resorts
WYNN
$9.43B
| $26.1M | 0.02% |
278,800
-3,500
| -1% | -$297K |
|
471
CALL
Hewlett Packard
HPE
$69B
| $26.1M | 0.01% |
1,274,300
-783,900
| -38% | -$13.1M |
|
472
CALL
Mercado Libre
MELI
$100B
| $25.9M | 0.01% |
9,900
-6,000
| -38% | -$14M |
|
473
PUT
Dow Inc
DOW
$21.3B
| $25.9M | 0.01% |
970,900
+369,200
| +61% | +$10.7M |
|
|
474
PUT
Hewlett Packard
HPE
$69B
| $25.8M | 0.01% |
1,264,000
+520,800
| +70% | +$8.73M |
|
475
PUT
Invesco Aerospace & Defense ETF
PPA
$7.91B
| $25.8M | 0.01% |
150,500
-801,900
| -84% | -$102M |
|
Similar funds
Simplex Trading's Q2 2025 Portfolio in Review
As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading's Q2 2025 filing shows 1,524 new, 3,308 increased, 3,590 reduced and 1,431 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $140M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 99% a quarter earlier, followed by Technology and Communication Services.
- Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
- Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
- Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
- Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
- Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
- Simplex Trading opened 1,524 new positions and closed 1,431 in Q2 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.
Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.