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 | Miscellaneous | 98.09% |
| 2 | Technology | 0.79% |
| 3 | Consumer Discretionary | 0.3% |
| 4 | Healthcare | 0.25% |
| 5 | Financials | 0.17% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
876
PUT
AstraZeneca
AZN
$252B
| $11.5M | 0.01% |
75,250
+9,450
| +14% | +$1.43M |
|
877
CALL
Marathon Petroleum
MPC
$109B
| $11.5M | 0.01% |
59,700
+3,900
| +7% | +$686K |
|
878
CALL
Automatic Data Processing
ADP
$110B
| $11.5M | 0.01% |
39,200
-8,600
| -18% | -$2.59M |
|
879
Bilibili
BILI
$6.37B
| $11.5M | 0.01% |
408,591
+101,392
| +33% | +$2.43M |
|
880
PUT
Global Payments
GPN
$24.5B
| $11.5M | 0.01% |
138,100
-128,300
| -48% | -$10.8M |
|
|
FLG
881
CALL
Flagstar Bank National Association
FLG
$5.61B
| $11.5M | 0.01% |
992,800
-83,900
| -8% | -$998K |
|
882
Palantir
PLTR
$419B
| $11.4M | 0.01% |
62,769
+54,898
| +697% | +$8.9M |
|
883
PUT
United Therapeutics
UTHR
$20.9B
| $11.4M | 0.01% |
27,300
+20,100
| +279% | +$6.76M |
|
884
PUT
Deckers Outdoor
DECK
$11.7B
| $11.4M | 0.01% |
112,700
-50,000
| -31% | -$5.45M |
|
885
SLB Ltd
SLB
$85.3B
| $11.4M | 0.01% |
332,317
+13,716
| +4% | +$477K |
|
886
Adobe
ADBE
$106B
| $11.4M | 0.01% |
32,247
+6,617
| +26% | +$2.37M |
|
887
PUT
GDS Holdings
GDS
$6.28B
| $11.4M | 0.01% |
293,600
+202,700
| +223% | +$7.19M |
|
888
PUT
AeroVironment
AVAV
$7.35B
| $11.3M | 0.01% |
36,000
+2,100
| +6% | +$543K |
|
889
PUT
Petrobras
PBR
$130B
| $11.3M | 0.01% |
894,000
-37,900
| -4% | -$476K |
|
890
PUT
Progressive
PGR
$127B
| $11.3M | 0.01% |
45,700
-9,400
| -17% | -$2.32M |
|
891
PUT
Hertz
HTZ
$820M
| $11.2M | 0.01% |
1,653,000
+32,400
| +2% | +$208K |
|
|
ETHE
892
PUT
Grayscale Ethereum Staking ETF Shares
ETHE
$1.87B
| $11.2M | 0.01% |
326,500
+311,200
| +2,034% | +$10.1M |
|
893
CALL
Cardinal Health
CAH
$57.5B
| $11.2M | 0.01% |
71,100
-13,700
| -16% | -$2.12M |
|
|
PONY
894
CALL
Pony AI Inc
PONY
$3.19B
| $11.2M | 0.01% |
496,000
+362,500
| +272% | +$5.51M |
|
|
GAP
895
CALL
The Gap Inc
GAP
$7.88B
| $11.2M | 0.01% |
521,400
+288,600
| +124% | +$6.24M |
|
896
PUT
Skyworks Solutions
SWKS
$11.1B
| $11.1M | 0.01% |
144,800
+4,100
| +3% | +$305K |
|
897
PUT
Ondas Inc
ONDS
$4.35B
| $11.1M | 0.01% |
1,439,500
+1,267,100
| +735% | +$5.26M |
|
898
D-Wave Quantum Inc
QBTS
$6.18B
| $11.1M | 0.01% |
449,601
+370,856
| +471% | +$6.76M |
|
899
CALL
American Conservative Values ETF
ACVF
$155M
| $11.1M | 0.01% |
1,509,800
+409,500
| +37% | +$19.7M |
|
900
PUT
ProShares Ether Strategy ETF
EETH
$68.2M
| $11.1M | 0.01% |
601,600
+524,500
| +680% | +$35.5M |
|
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, 3,249 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 Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- 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.