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 | Technology | 0.74% |
| 2 | Communication Services | 0.19% |
| 3 | Consumer Discretionary | 0.18% |
| 4 | Healthcare | 0.17% |
| 5 | Financials | 0.14% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
351
CALL
Intuitive Surgical
ISRG
$121B
| $38.1M | 0.02% |
70,200
-100,100
| -59% | -$52.3M |
|
352
CALL
Kraft Heinz
KHC
$30.8B
| $38M | 0.02% |
1,471,700
+513,700
| +54% | +$14.3M |
|
353
CALL
ConocoPhillips
COP
$145B
| $38M | 0.02% |
441,400
+1,400
| +0.3% | +$126K |
|
354
PUT
Charter Communications
CHTR
$15.9B
| $37.7M | 0.02% |
92,300
+9,800
| +12% | +$3.75M |
|
355
PUT
Caterpillar
CAT
$410B
| $37.5M | 0.02% |
96,700
-17,900
| -16% | -$5.97M |
|
356
PUT
Cameco
CCJ
$39.4B
| $37.2M | 0.02% |
501,000
-83,600
| -14% | -$4.46M |
|
357
Nike
NKE
$62.6B
| $37.1M | 0.02% |
522,792
-14,487
| -3% | -$870K |
|
358
PUT
RTX Corp
RTX
$262B
| $36.9M | 0.02% |
252,700
-50,100
| -17% | -$6.68M |
|
359
PUT
Mercado Libre
MELI
$91.2B
| $36.9M | 0.02% |
14,100
-8,200
| -37% | -$19.1M |
|
360
PUT
Altria Group
MO
$121B
| $36.8M | 0.02% |
628,200
+260,000
| +71% | +$15.3M |
|
361
CALL
IonQ
IONQ
$12.9B
| $36.8M | 0.02% |
856,600
+335,400
| +64% | +$11.2M |
|
362
CALL
Amphenol
APH
$194B
| $36.7M | 0.02% |
371,900
+44,100
| +13% | +$3.61M |
|
363
CALL
Nu Holdings
NU
$70.1B
| $36.6M | 0.02% |
2,670,700
-505,800
| -16% | -$6.06M |
|
|
ZVOL
364
CALL
Volatility Premium Plus ETF
ZVOL
$13.1M
| $36.6M | 0.02% |
672,700
-284,500
| -30% | -$3.78M |
|
365
PUT
Lockheed Martin
LMT
$119B
| $36.6M | 0.02% |
79,000
-8,500
| -10% | -$3.98M |
|
|
ECHO
366
PUT
EchoStar
ECHO
$26.7B
| $36.5M | 0.02% |
1,318,500
+1,066,200
| +423% | +$23.4M |
|
367
PUT
Datadog
DDOG
$87.5B
| $36.4M | 0.02% |
270,900
-189,400
| -41% | -$21M |
|
368
CALL
Abbott
ABT
$175B
| $36.1M | 0.02% |
265,500
-62,200
| -19% | -$8.2M |
|
369
CALL
Archer Aviation
ACHR
$3.95B
| $35.9M | 0.02% |
3,312,800
+1,622,200
| +96% | +$15.2M |
|
370
CALL
Delta Air Lines
DAL
$54.9B
| $35.9M | 0.02% |
730,200
-408,200
| -36% | -$18.7M |
|
371
PUT
Gilead Sciences
GILD
$162B
| $35.7M | 0.02% |
321,700
-228,700
| -42% | -$24.3M |
|
372
Alibaba
BABA
$279B
| $35.7M | 0.02% |
+314,372
| New | +$37.2M |
|
373
PUT
Rocket Lab Corp
RKLB
$43.6B
| $35.4M | 0.02% |
989,900
+229,500
| +30% | +$5.62M |
|
374
PUT
Southwest Airlines
LUV
$23.3B
| $35.2M | 0.02% |
1,084,300
+252,200
| +30% | +$7.6M |
|
375
CALL
eBay
EBAY
$49.3B
| $35.1M | 0.02% |
471,900
+72,300
| +18% | +$5.12M |
|
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 withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.
- 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 1,525 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.