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 | |
|---|---|---|---|---|---|---|
2326
BioNTech
BNTX
$22.6B
| $2.01M | ﹤0.01% |
20,361
+12,755
| +168% | +$1.36M |
|
2327
CALL
OppFi
OPFI
$770M
| $2.01M | ﹤0.01% |
177,200
-20,900
| -11% | -$235K |
|
2328
Wendy's
WEN
$1.33B
| $2.01M | ﹤0.01% |
+219,138
| New | +$2.25M |
|
2329
PUT
Groupon
GRPN
$980M
| $2M | ﹤0.01% |
85,800
-139,900
| -62% | -$4.02M |
|
2330
CALL
Burford Capital
BUR
$907M
| $2M | ﹤0.01% |
167,200
+59,900
| +56% | +$801K |
|
|
TEN
2331
PUT
Tsakos Energy Navigation Ltd
TEN
$1.19B
| $2M | ﹤0.01% |
89,900
+58,500
| +186% | +$1.23M |
|
2332
Whirlpool
WHR
$2.42B
| $2M | ﹤0.01% |
25,401
+5,930
| +30% | +$544K |
|
2333
WEC Energy
WEC
$37.7B
| $2M | ﹤0.01% |
17,413
+16,866
| +3,083% | +$1.83M |
|
2334
CALL
Vanguard Short-Term Treasury ETF
VGSH
$29.3B
| $1.99M | ﹤0.01% |
22,600
-37,200
| -62% | -$2.18M |
|
2335
PUT
Huntington Bancshares
HBAN
$35.1B
| $1.99M | ﹤0.01% |
115,200
+38,900
| +51% | +$665K |
|
2336
PUT
Trane Technologies
TT
$106B
| $1.98M | ﹤0.01% |
4,700
+2,000
| +74% | +$855K |
|
2337
CALL
TransDigm Group
TDG
$69.2B
| $1.98M | ﹤0.01% |
1,500
-500
| -25% | -$715K |
|
|
USAR
2338
USA Rare Earth Inc
USAR
$3.46B
| $1.98M | ﹤0.01% |
114,913
+85,231
| +287% | +$1.22M |
|
2339
PUT
H&R Block
HRB
$5.18B
| $1.97M | ﹤0.01% |
39,000
-13,500
| -26% | -$713K |
|
|
SEZL
2340
PUT
Sezzle
SEZL
$5.17B
| $1.97M | ﹤0.01% |
24,800
-17,200
| -41% | -$1.97M |
|
2341
CALL
Anavex Life Sciences
AVXL
$222M
| $1.97M | ﹤0.01% |
221,300
+53,300
| +32% | +$541K |
|
2342
Lincoln National
LNC
$7.91B
| $1.97M | ﹤0.01% |
48,786
+47,784
| +4,769% | +$1.85M |
|
2343
CALL
Flex
FLEX
$43.4B
| $1.97M | ﹤0.01% |
33,900
+14,000
| +70% | +$744K |
|
2344
PUT
Eversource Energy
ES
$28.2B
| $1.96M | ﹤0.01% |
27,600
+1,700
| +7% | +$111K |
|
2345
CALL
ADMA Biologics
ADMA
$1.92B
| $1.96M | ﹤0.01% |
133,900
-5,100
| -4% | -$87.4K |
|
2346
FirstEnergy
FE
$28.9B
| $1.96M | ﹤0.01% |
42,836
-44,154
| -51% | -$1.88M |
|
|
RNAM
2347
DELISTED
Avidity Biosciences
RNAM
| $1.96M | ﹤0.01% |
44,898
+42,002
| +1,450% | +$1.7M |
|
2348
PUT
Invesco DB US Dollar Index Bullish Fund
UUP
$434M
| $1.95M | ﹤0.01% |
71,500
-40,900
| -36% | -$1.12M |
|
2349
Nasdaq
NDAQ
$51.5B
| $1.95M | ﹤0.01% |
+22,041
| New | +$2.04M |
|
2350
CALL
Bruker
BRKR
$9.2B
| $1.95M | ﹤0.01% |
59,900
+19,000
| +46% | +$677K |
|
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.