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 |
Microsoft
MSFT
|
+$234M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$97.5M |
| 3 |
Amazon
AMZN
|
+$96.8M |
| 4 |
iShares Bitcoin Trust
IBIT
|
+$80.6M |
| 5 |
Pinduoduo
PDD
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$129M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$92.9M |
| 3 |
Broadcom
AVGO
|
+$82.9M |
| 4 |
Alphabet (Google) Class C
GOOG
|
+$68.4M |
| 5 |
Meta Platforms (Facebook)
META
|
+$59.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.79% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Healthcare | 0.25% |
| 4 | Financials | 0.17% |
| 5 | Industrials | 0.09% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
326
CALL
Agnico Eagle Mines
AEM
$73.5B
| $56.1M | 0.03% |
333,100
-17,300
| -5% | -$2.38M |
|
327
CALL
Opendoor
OPEN
$4.23B
| $56M | 0.03% |
7,258,857
+6,392,304
| +738% | +$25.9M |
|
328
CALL
DraftKings
DKNG
$11.3B
| $55.7M | 0.03% |
1,490,300
+139,000
| +10% | +$6.16M |
|
329
CALL
Seagate
STX
$205B
| $55.5M | 0.03% |
235,200
+87,200
| +59% | +$14.9M |
|
|
ECHO
330
CALL
EchoStar
ECHO
$26.7B
| $55M | 0.03% |
720,200
+328,700
| +84% | +$14.9M |
|
331
PUT
Applied Digital
APLD
$8.6B
| $54.9M | 0.03% |
2,394,400
+1,005,800
| +72% | +$14.9M |
|
332
PUT
Blackstone
BX
$150B
| $54.9M | 0.03% |
321,100
+39,600
| +14% | +$6.78M |
|
333
PUT
D-Wave Quantum
QBTS
$6.43B
| $54.7M | 0.03% |
2,215,100
+1,014,900
| +85% | +$18.5M |
|
334
CALL
Celsius Holdings
CELH
$7.28B
| $54.6M | 0.03% |
950,400
+43,300
| +5% | +$2.26M |
|
335
CALL
PG&E
PCG
$39.9B
| $54.6M | 0.03% |
3,622,200
+1,526,500
| +73% | +$22.3M |
|
336
PUT
Philip Morris
PM
$303B
| $54.4M | 0.03% |
335,600
+27,200
| +9% | +$4.58M |
|
|
BMNR
337
CALL
BitMine Immersion Technologies
BMNR
$10.7B
| $54.4M | 0.03% |
+1,048,000
| New | +$53.1M |
|
338
CALL
AST SpaceMobile
ASTS
$18.5B
| $54.4M | 0.03% |
1,108,600
-129,700
| -10% | -$6.25M |
|
|
SCIU
339
CALL
DELISTED
Global X Scientific Beta US ETF
SCIU
| $54.2M | 0.03% |
1,018,500
-320,500
| -24% | -$17M |
|
340
PUT
United Airlines
UAL
$38.1B
| $53.5M | 0.03% |
554,500
-205,800
| -27% | -$19.8M |
|
341
PUT
NIO
NIO
$11.7B
| $52.7M | 0.03% |
6,913,600
+3,854,600
| +126% | +$20.8M |
|
342
PUT
Airbnb
ABNB
$83.1B
| $52.4M | 0.03% |
431,700
+17,700
| +4% | +$2.29M |
|
343
PUT
State Street SPDR Portfolio Short Term Treasury ETF
SPTS
$6.06B
| $52.3M | 0.03% |
398,800
-94,700
| -19% | -$2.77M |
|
344
CALL
Upstart Holdings
UPST
$2.74B
| $52.3M | 0.03% |
1,029,200
+556,800
| +118% | +$39.2M |
|
345
CALL
Comcast
CMCSA
$84B
| $52.2M | 0.03% |
1,661,700
-145,000
| -8% | -$4.86M |
|
346
CALL
Rivian
RIVN
$24.9B
| $51.8M | 0.03% |
3,530,100
-123,800
| -3% | -$1.66M |
|
347
PUT
Sea Limited
SE
$64.2B
| $51.7M | 0.03% |
289,200
+107,300
| +59% | +$18.4M |
|
348
PUT
Rocket Lab Corp
RKLB
$43.6B
| $51.2M | 0.03% |
1,069,100
+79,200
| +8% | +$3.59M |
|
349
PUT
Altria Group
MO
$121B
| $50.6M | 0.03% |
766,100
+137,900
| +22% | +$8.74M |
|
350
CALL
CleanSpark
CLSK
$3.93B
| $50.6M | 0.03% |
3,490,200
+925,800
| +36% | +$10.4M |
|
Similar funds
Simplex Trading's Q3 2025 Portfolio in Review
As of Q3 2025, Simplex Trading held 10,358 positions worth $195B, up 12% from $175B the previous quarter. Its ten largest holdings account for 46% of the portfolio.
Simplex Trading's Q3 2025 filing shows 1,743 new, 3,828 increased, 3,250 reduced and 1,308 closed positions. Its largest new stake was Microsoft: 458,309 shares worth $237M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $129M.
By sector, the portfolio is most concentrated in Technology at 0.79% of assets, up from 0.74% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2025 buy was Microsoft: 458,309 shares worth $237M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q3 2025, an estimated $97.5M increase.
- Simplex Trading's biggest Q3 2025 reduction was Alphabet (Google) Class A, cutting an estimated $92.9M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q3 2025, selling an estimated $129M.
- Simplex Trading's ten largest holdings make up 46% of its $195B portfolio in Q3 2025.
- Simplex Trading opened 1,743 new positions and closed 1,308 in Q3 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $195B.
Based on Simplex Trading's 13F filing for Q3 2025, filed 12 Nov 2025.