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 | |
|---|---|---|---|---|---|---|
3351
PUT
Crescent Energy
CRGY
$3.46B
| $575K | ﹤0.01% |
66,900
+5,300
| +9% | +$46.4K |
|
3352
PUT
Haemonetics
HAE
$3.63B
| $574K | ﹤0.01% |
7,700
+6,400
| +492% | +$424K |
|
3353
Omega Healthcare
OHI
$15.3B
| $574K | ﹤0.01% |
15,678
+11,846
| +309% | +$440K |
|
3354
Vipshop
VIPS
$7.08B
| $573K | ﹤0.01% |
38,122
+13,703
| +56% | +$194K |
|
|
ZK
3355
CALL
DELISTED
Zeekr
ZK
| $573K | ﹤0.01% |
22,500
+10,900
| +94% | +$269K |
|
3356
CALL
Cedar Fair
FUN
$1.8B
| $572K | ﹤0.01% |
18,800
+17,700
| +1,609% | +$593K |
|
3357
CALL
Idaho Strategic Resources
IDR
$458M
| $572K | ﹤0.01% |
43,800
-141,900
| -76% | -$2.09M |
|
3358
Dow Inc
DOW
$20.8B
| $571K | ﹤0.01% |
+21,449
| New | +$624K |
|
3359
CALL
Hubbell
HUBB
$26.3B
| $571K | ﹤0.01% |
1,400
+700
| +100% | +$260K |
|
3360
Ocular Therapeutix
OCUL
$1.89B
| $571K | ﹤0.01% |
61,578
+11,616
| +23% | +$90.9K |
|
3361
PUT
Bio-Techne
TECH
$11.2B
| $571K | ﹤0.01% |
11,100
+10,700
| +2,675% | +$538K |
|
3362
PUT
Clear Secure
YOU
$5.36B
| $571K | ﹤0.01% |
20,600
-188,000
| -90% | -$4.79M |
|
3363
Amneal Pharmaceuticals
AMRX
$5.78B
| $570K | ﹤0.01% |
70,527
+1,978
| +3% | +$14.9K |
|
|
DFTX
3364
Definium Therapeutics
DFTX
$5.66B
| $570K | ﹤0.01% |
87,951
+40,095
| +84% | +$264K |
|
3365
Cogent Biosciences
COGT
$6.91B
| $569K | ﹤0.01% |
79,361
+79,349
| +661,242% | +$440K |
|
3366
PUT
Antero Midstream
AM
$10.4B
| $568K | ﹤0.01% |
30,000
+300
| +1% | +$5.36K |
|
3367
PUT
Brookfield Renewable
BEP
$9.74B
| $568K | ﹤0.01% |
22,300
-9,200
| -29% | -$216K |
|
3368
PUT
Sabre
SABR
$704M
| $567K | ﹤0.01% |
179,500
-73,700
| -29% | -$189K |
|
|
SOBO
3369
PUT
South Bow Corp
SOBO
$7.79B
| $567K | ﹤0.01% |
21,900
+18,800
| +606% | +$478K |
|
3370
PUT
Herc Holdings
HRI
$5.34B
| $566K | ﹤0.01% |
4,300
-4,100
| -49% | -$498K |
|
3371
Lightspeed Commerce
LSPD
$1.35B
| $566K | ﹤0.01% |
48,373
-22,147
| -31% | -$228K |
|
3372
PUT
Blackstone Secured Lending
BXSL
$5.35B
| $565K | ﹤0.01% |
18,400
+3,300
| +22% | +$101K |
|
3373
Ventas
VTR
$48.7B
| $565K | ﹤0.01% |
+8,958
| New | +$585K |
|
3374
PUT
Air Products & Chemicals
APD
$65.2B
| $564K | ﹤0.01% |
2,000
-7,300
| -78% | -$2M |
|
3375
CALL
Leggett & Platt
LEG
$1.5B
| $564K | ﹤0.01% |
63,300
-3,000
| -5% | -$25.8K |
|
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.