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 | |
|---|---|---|---|---|---|---|
7301
CALL
Simulations Plus
SLP
$371M
| $21K | ﹤0.01% |
+1,400
| New | +$20.4K |
|
7302
PUT
SoundThinking
SSTI
$110M
| $21K | ﹤0.01% |
1,800
-1,300
| -42% | -$16.1K |
|
7303
Waterstone Financial
WSBF
$372M
| $21K | ﹤0.01% |
+1,362
| New | +$19.5K |
|
7304
PUT
Exagen
XGN
$108M
| $21K | ﹤0.01% |
2,000
+300
| +18% | +$2.66K |
|
7305
PUT
Yelp
YELP
$1.51B
| $21K | ﹤0.01% |
700
-800
| -53% | -$26.2K |
|
|
LIF
7306
PUT
Life360
LIF
$4.59B
| $21K | ﹤0.01% |
200
| – | – |
|
|
WYFI
7307
CALL
WhiteFiber Inc
WYFI
$908M
| $21K | ﹤0.01% |
+800
| New | +$15.6K |
|
7308
PUT
ACV Auctions
ACVA
$1.43B
| $20K | ﹤0.01% |
2,100
-8,200
| -80% | -$105K |
|
7309
CALL
Ameren
AEE
$31.1B
| $20K | ﹤0.01% |
200
-4,500
| -96% | -$449K |
|
7310
CALL
Allogene Therapeutics
ALLO
$573M
| $20K | ﹤0.01% |
16,300
+6,800
| +72% | +$8.11K |
|
|
CCRN
7311
DELISTED
Cross Country Healthcare
CCRN
| $20K | ﹤0.01% |
+1,410
| New | +$18.6K |
|
7312
PUT
Grupo Cibest SA
CIB
$21.1B
| $20K | ﹤0.01% |
400
-2,700
| -87% | -$130K |
|
7313
CALL
Columbia Sportswear
COLM
$3.3B
| $20K | ﹤0.01% |
400
+100
| +33% | +$5.62K |
|
7314
CALL
Enlivex Ltd
ENLV
$37.7M
| $20K | ﹤0.01% |
1,327
+1,180
| +803% | +$21.3K |
|
7315
PUT
Federated Hermes
FHI
$4.59B
| $20K | ﹤0.01% |
400
-400
| -50% | -$20.3K |
|
7316
PUT
Frontdoor
FTDR
$5.22B
| $20K | ﹤0.01% |
300
-1,200
| -80% | -$73.1K |
|
7317
CALL
Fulton Financial
FULT
$4.73B
| $20K | ﹤0.01% |
1,100
-1,300
| -54% | -$24.6K |
|
|
GAU
7318
CALL
Galiano Gold
GAU
$455M
| $20K | ﹤0.01% |
9,500
| – | – |
|
7319
Grid Dynamics Holdings
GDYN
$513M
| $20K | ﹤0.01% |
+2,676
| New | +$23.9K |
|
7320
CALL
Garrett Motion
GTX
$5.6B
| $20K | ﹤0.01% |
1,500
-4,200
| -74% | -$53.2K |
|
7321
CALL
Harmonic Inc
HLIT
$1.2B
| $20K | ﹤0.01% |
2,000
| – | – |
|
7322
CALL
Houlihan Lokey
HLI
$10.2B
| $20K | ﹤0.01% |
+100
| New | +$19.6K |
|
7323
PUT
Heartland Express
HTLD
$1.04B
| $20K | ﹤0.01% |
2,500
+1,100
| +79% | +$9.31K |
|
7324
Inogen
INGN
$174M
| $20K | ﹤0.01% |
2,524
+1,631
| +183% | +$12.2K |
|
7325
CALL
Jakks Pacific
JAKK
$305M
| $20K | ﹤0.01% |
1,100
-300
| -21% | -$5.51K |
|
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.