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 | |
|---|---|---|---|---|---|---|
926
CALL
Expedia Group
EXPE
$30.9B
| $10.6M | 0.01% |
49,800
+36,600
| +277% | +$7.35M |
|
927
CALL
Madrigal Pharmaceuticals
MDGL
$12.5B
| $10.6M | 0.01% |
23,200
+8,500
| +58% | +$3.17M |
|
928
CALL
Global Payments
GPN
$21.3B
| $10.6M | 0.01% |
128,000
-42,300
| -25% | -$3.56M |
|
929
PUT
Advance Auto Parts
AAP
$3.22B
| $10.6M | 0.01% |
173,000
-106,700
| -38% | -$6.31M |
|
930
CALL
BridgeBio Pharma
BBIO
$16.2B
| $10.6M | 0.01% |
204,500
-86,500
| -30% | -$4.22M |
|
931
PUT
JetBlue
JBLU
$1.86B
| $10.6M | 0.01% |
2,158,400
+232,100
| +12% | +$1.11M |
|
932
PUT
S&P Global
SPGI
$124B
| $10.6M | 0.01% |
21,800
+12,000
| +122% | +$6.43M |
|
933
CALL
Doximity
DOCS
$3.68B
| $10.6M | 0.01% |
145,000
+47,700
| +49% | +$3.11M |
|
934
CALL
SAP
SAP
$171B
| $10.6M | 0.01% |
39,500
-39,100
| -50% | -$11M |
|
935
CALL
VF Corp
VFC
$6.49B
| $10.5M | 0.01% |
731,100
+105,500
| +17% | +$1.42M |
|
936
CALL
Sarepta Therapeutics
SRPT
$1.68B
| $10.5M | 0.01% |
547,400
+77,900
| +17% | +$1.39M |
|
937
CALL
ArcelorMittal
MT
$49.9B
| $10.5M | 0.01% |
291,500
+49,600
| +21% | +$1.67M |
|
938
CALL
GSK
GSK
$102B
| $10.5M | 0.01% |
243,800
-20,900
| -8% | -$816K |
|
939
CALL
Bitdeer Technologies
BTDR
$2.96B
| $10.5M | 0.01% |
615,200
+86,800
| +16% | +$1.22M |
|
940
3M
MMM
$87.5B
| $10.5M | 0.01% |
67,633
+62,109
| +1,124% | +$9.58M |
|
941
CALL
Maplebear
CART
$10B
| $10.5M | 0.01% |
285,500
+42,500
| +17% | +$1.96M |
|
|
P
942
PUT
Everpure Inc
P
$25B
| $10.5M | 0.01% |
125,200
-43,400
| -26% | -$2.89M |
|
943
CALL
NextNav
NN
$1.73B
| $10.5M | 0.01% |
732,100
+139,000
| +23% | +$2.19M |
|
944
PUT
American Tower
AMT
$76.7B
| $10.5M | 0.01% |
54,400
-4,900
| -8% | -$1.02M |
|
945
CALL
Vanguard Dividend Appreciation ETF
VIG
$110B
| $10.4M | 0.01% |
48,400
+22,100
| +84% | +$4.64M |
|
946
PUT
United Rentals
URI
$71.4B
| $10.4M | 0.01% |
10,900
-300
| -3% | -$267K |
|
947
CALL
Invesco DB US Dollar Index Bullish Fund
UUP
$434M
| $10.4M | 0.01% |
491,000
-63,200
| -11% | -$1.73M |
|
948
PUT
Lennar Class A
LEN
$19.8B
| $10.4M | 0.01% |
124,200
-148,900
| -55% | -$18.5M |
|
949
PUT
Starwood Property Trust
STWD
$6.05B
| $10.4M | 0.01% |
535,500
+198,900
| +59% | +$4M |
|
950
PUT
GitLab
GTLB
$5.1B
| $10.3M | 0.01% |
229,200
+51,300
| +29% | +$2.35M |
|
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.