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 | |
|---|---|---|---|---|---|---|
3576
PUT
Vanguard FTSE Europe ETF
VGK
$30.1B
| $468K | ﹤0.01% |
6,500
-26,700
| -80% | -$1.97M |
|
3577
PUT
Canadian Imperial Bank of Commerce
CM
$108B
| $467K | ﹤0.01% |
6,600
-3,300
| -33% | -$212K |
|
|
HTGCR
3578
CALL
DELISTED
HERCULES TECHNOLOGY GROWTH CAP INC TRANS RGTS TO PUR COM STK
HTGCR
| $467K | ﹤0.01% |
25,600
+10,800
| +73% | +$197K |
|
3579
Colgate-Palmolive
CL
$73.6B
| $466K | ﹤0.01% |
5,132
-18,752
| -79% | -$1.71M |
|
3580
PUT
Danaos Corp
DAC
$2.55B
| $465K | ﹤0.01% |
5,400
+5,300
| +5,300% | +$435K |
|
|
KLG
3581
PUT
DELISTED
WK Kellogg Co
KLG
| $465K | ﹤0.01% |
29,200
+24,000
| +462% | +$418K |
|
3582
PUT
Prime Medicine
PRME
$544M
| $464K | ﹤0.01% |
188,200
+175,900
| +1,430% | +$271K |
|
3583
CALL
Immunovant
IMVT
$8.23B
| $462K | ﹤0.01% |
28,900
-75,500
| -72% | -$1.14M |
|
3584
CALL
Taboola.com
TBLA
$1.35B
| $462K | ﹤0.01% |
126,500
| – | – |
|
|
ONIT
3585
PUT
Onity Group
ONIT
$336M
| $461K | ﹤0.01% |
12,100
+6,100
| +102% | +$216K |
|
|
SVM
3586
CALL
Silvercorp Metals
SVM
$2.16B
| $460K | ﹤0.01% |
109,200
+108,200
| +10,820% | +$419K |
|
3587
CALL
Wabtec
WAB
$50.8B
| $460K | ﹤0.01% |
2,200
+1,100
| +100% | +$212K |
|
3588
Zebra Technologies
ZBRA
$12.6B
| $460K | ﹤0.01% |
1,494
+1,284
| +611% | +$349K |
|
|
RYZ
3589
CALL
Ryerson Holding Corp
RYZ
$1.59B
| $459K | ﹤0.01% |
+21,300
| New | +$459K |
|
3590
PUT
Cullinan Oncology
CGEM
$1.07B
| $458K | ﹤0.01% |
60,900
+57,000
| +1,462% | +$458K |
|
3591
Cleveland-Cliffs
CLF
$6.99B
| $458K | ﹤0.01% |
60,323
-461,300
| -88% | -$3.43M |
|
3592
PUT
Huntington Ingalls Industries
HII
$11.4B
| $458K | ﹤0.01% |
1,900
| – | – |
|
3593
CALL
Boot Barn
BOOT
$4.71B
| $456K | ﹤0.01% |
3,000
-9,300
| -76% | -$1.23M |
|
3594
CALL
Invesco DB Base Metals Fund
DBB
$308M
| $456K | ﹤0.01% |
20,800
+6,900
| +50% | +$127K |
|
|
KEEL
3595
Keel Infrastructure Corp
KEEL
$2.45B
| $454K | ﹤0.01% |
541,468
+253,852
| +88% | +$235K |
|
3596
CALL
ITT
ITT
$17.7B
| $454K | ﹤0.01% |
2,900
-1,000
| -26% | -$142K |
|
|
HOUS
3597
DELISTED
Anywhere Real Estate
HOUS
| $453K | ﹤0.01% |
125,324
+54,251
| +76% | +$189K |
|
3598
Nordic American Tanker
NAT
$1.37B
| $453K | ﹤0.01% |
172,498
-123,736
| -42% | -$323K |
|
3599
NextNav
NN
$1.73B
| $453K | ﹤0.01% |
29,812
-25,739
| -46% | -$330K |
|
|
KDK
3600
PUT
Kodiak AI
KDK
$821M
| $453K | ﹤0.01% |
+40,000
| New | +$451K |
|
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.