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 | |
|---|---|---|---|---|---|---|
3401
TransAlta
TAC
$4.25B
| $553K | ﹤0.01% |
51,321
-12,784
| -20% | -$122K |
|
3402
CF Industries
CF
$18.4B
| $552K | ﹤0.01% |
+6,002
| New | +$511K |
|
3403
CALL
Alpha Metallurgical Resources
AMR
$1.85B
| $551K | ﹤0.01% |
4,900
-3,800
| -44% | -$444K |
|
3404
CALL
Getty Images
GETY
$173M
| $551K | ﹤0.01% |
332,200
-100
| -0% | -$176 |
|
|
AMED
3405
CALL
DELISTED
Amedisys
AMED
| $550K | ﹤0.01% |
5,600
+2,700
| +93% | +$255K |
|
3406
CALL
Chemours
CC
$2.55B
| $550K | ﹤0.01% |
48,100
-300
| -0.6% | -$3.38K |
|
3407
Eversource Energy
ES
$28.1B
| $550K | ﹤0.01% |
8,656
+8,133
| +1,555% | +$501K |
|
3408
PUT
The RealReal
REAL
$1.4B
| $549K | ﹤0.01% |
114,700
+2,000
| +2% | +$11K |
|
3409
CALL
EPAM Systems
EPAM
$4.92B
| $548K | ﹤0.01% |
3,100
-5,800
| -65% | -$970K |
|
3410
CALL
Grocery Outlet
GO
$932M
| $548K | ﹤0.01% |
44,200
-16,200
| -27% | -$230K |
|
3411
CALL
ZTO Express
ZTO
$18.1B
| $548K | ﹤0.01% |
30,900
-28,100
| -48% | -$509K |
|
3412
PUT
C.H. Robinson
CHRW
$20.6B
| $546K | ﹤0.01% |
5,700
+4,700
| +470% | +$440K |
|
3413
PUT
Paysafe
PSFE
$440M
| $546K | ﹤0.01% |
43,300
+40,700
| +1,565% | +$557K |
|
|
DDL
3414
CALL
Dingdong
DDL
$523M
| $545K | ﹤0.01% |
270,200
+240,700
| +816% | +$544K |
|
3415
CALL
Hannon Armstrong Sustainable Infrastructure Capital
HASI
$4.91B
| $545K | ﹤0.01% |
20,300
-23,400
| -54% | -$607K |
|
|
MREO
3416
Mereo BioPharma
MREO
$48.2M
| $545K | ﹤0.01% |
201,141
+197,024
| +4,786% | +$475K |
|
3417
PUT
Onto Innovation
ONTO
$13B
| $545K | ﹤0.01% |
5,400
-1,200
| -18% | -$128K |
|
3418
Opendoor
OPEN
$3.71B
| $545K | ﹤0.01% |
1,057,948
+708,989
| +203% | +$512K |
|
3419
CALL
Wolverine World Wide
WWW
$1.56B
| $544K | ﹤0.01% |
30,100
+22,300
| +286% | +$340K |
|
3420
CALL
CareDx
CDNA
$1.88B
| $543K | ﹤0.01% |
27,800
+21,600
| +348% | +$384K |
|
3421
CALL
Global Partners
GLP
$1.64B
| $543K | ﹤0.01% |
10,300
+4,000
| +63% | +$206K |
|
3422
CALL
Thomson Reuters
TRI
$42.7B
| $543K | ﹤0.01% |
2,658
+1,772
| +200% | +$337K |
|
3423
PUT
Xylem
XYL
$28.6B
| $543K | ﹤0.01% |
4,200
-4,900
| -54% | -$593K |
|
3424
CALL
Ryanair
RYAAY
$29.8B
| $542K | ﹤0.01% |
9,400
+8,900
| +1,780% | +$453K |
|
3425
PUT
Genmab
GMAB
$17.7B
| $541K | ﹤0.01% |
26,200
-56,400
| -68% | -$1.16M |
|
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.