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 |
Apple
AAPL
|
+$552M |
| 2 |
Strategy Inc
MSTR
|
+$85.8M |
| 3 |
MSTX
Defiance Daily Target 2x Long MSTR ETF
MSTX
|
+$48.1M |
| 4 |
Intel
INTC
|
+$45.4M |
| 5 |
Uber
UBER
|
+$43M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$133M |
| 2 |
Pinduoduo
PDD
|
+$82.6M |
| 3 |
Boeing
BA
|
+$49.8M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$45.1M |
| 5 |
Microsoft
MSFT
|
+$41M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.68% |
| 2 | Consumer Discretionary | 0.23% |
| 3 | Healthcare | 0.19% |
| 4 | Financials | 0.13% |
| 5 | Communication Services | 0.11% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3401
PUT
IDT Corp
IDT
$1.63B
| $560K | ﹤0.01% |
11,800
+11,700
| +11,700% | +$561K |
|
|
SW
3402
CALL
Smurfit Westrock
SW
$26.3B
| $560K | ﹤0.01% |
12,500
+3,800
| +44% | +$194K |
|
3403
DigitalBridge
DBRG
$2.93B
| $559K | ﹤0.01% |
+49,599
| New | +$667K |
|
3404
CALL
Assured Guaranty
AGO
$3.78B
| $558K | ﹤0.01% |
6,200
-5,000
| -45% | -$438K |
|
|
AVDX
3405
CALL
DELISTED
AvidXchange
AVDX
| $558K | ﹤0.01% |
54,000
+20,900
| +63% | +$204K |
|
3406
PUT
SIGA Technologies
SIGA
$222M
| $558K | ﹤0.01% |
92,900
+3,500
| +4% | +$23.4K |
|
3407
CALL
WD-40
WDFC
$3.13B
| $558K | ﹤0.01% |
2,300
+500
| +28% | +$133K |
|
3408
PUT
Galectin Therapeutics
GALT
$223M
| $557K | ﹤0.01% |
432,200
+429,000
| +13,406% | +$1.03M |
|
|
XIFR
3409
PUT
XPLR Infrastructure LP
XIFR
$1.19B
| $557K | ﹤0.01% |
288,000
+189,600
| +193% | +$3.78M |
|
|
LGF.A
3410
DELISTED
Lions Gate Entertainment Corp. Class A Voting Shares
LGF.A
| $557K | ﹤0.01% |
65,244
+40,703
| +166% | +$321K |
|
|
RVNC
3411
CALL
DELISTED
Revance Therapeutics, Inc.
RVNC
| $556K | ﹤0.01% |
182,900
+90,300
| +98% | +$393K |
|
3412
CALL
The Greenbrier Companies
GBX
$1.56B
| $555K | ﹤0.01% |
9,100
-6,500
| -42% | -$396K |
|
3413
PUT
Middleby
MIDD
$6.15B
| $555K | ﹤0.01% |
4,100
+2,300
| +128% | +$317K |
|
3414
PUT
Liberty Energy
LBRT
$2.75B
| $554K | ﹤0.01% |
27,900
+22,400
| +407% | +$414K |
|
3415
CALL
Xometry
XMTR
$4.75B
| $554K | ﹤0.01% |
13,000
+6,500
| +100% | +$184K |
|
3416
InterDigital
IDCC
$6.7B
| $553K | ﹤0.01% |
+2,859
| New | +$500K |
|
3417
CALL
Maravai LifeSciences
MRVI
$987M
| $553K | ﹤0.01% |
101,500
+86,600
| +581% | +$557K |
|
3418
CALL
Scholar Rock
SRRK
$5.86B
| $553K | ﹤0.01% |
12,800
+11,400
| +814% | +$371K |
|
3419
CALL
Build-A-Bear
BBW
$428M
| $552K | ﹤0.01% |
12,000
-1,100
| -8% | -$42.7K |
|
3420
CALL
Hannon Armstrong Sustainable Infrastructure Capital
HASI
$4.91B
| $552K | ﹤0.01% |
20,600
-20,900
| -50% | -$654K |
|
3421
CALL
Interparfums
IPAR
$3.99B
| $552K | ﹤0.01% |
4,200
+2,400
| +133% | +$308K |
|
3422
CALL
Banco Macro
BMA
$5.89B
| $551K | ﹤0.01% |
5,700
-4,600
| -45% | -$377K |
|
3423
CALL
Janux Therapeutics
JANX
$950M
| $551K | ﹤0.01% |
10,300
+8,100
| +368% | +$428K |
|
|
JMIA
3424
Jumia Technologies
JMIA
$752M
| $551K | ﹤0.01% |
144,444
-31,912
| -18% | -$143K |
|
3425
SSR Mining
SSRM
$5.45B
| $551K | ﹤0.01% |
79,234
+57,604
| +266% | +$358K |
|
Similar funds
Simplex Trading's Q4 2024 Portfolio in Review
As of Q4 2024, Simplex Trading held 10,008 positions worth $179B, up 4.8% from $170B the previous quarter. Its ten largest holdings account for 49% of the portfolio.
Simplex Trading's Q4 2024 filing shows 1,520 new, 3,222 increased, 3,616 reduced and 1,504 closed positions. Its largest new stake was Strategy Inc: 285,022 shares worth $82.5M. The largest sale was NVIDIA, an estimated $133M.
By sector, the portfolio is most concentrated in Technology at 0.68% of assets, up from 0.4% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q4 2024 buy was Strategy Inc: 285,022 shares worth $82.5M.
- Simplex Trading added most to Apple in Q4 2024, an estimated $552M increase.
- Simplex Trading's biggest Q4 2024 reduction was NVIDIA, cutting an estimated $133M.
- Simplex Trading fully exited Pinduoduo in Q4 2024, selling an estimated $82.6M.
- Simplex Trading's ten largest holdings make up 49% of its $179B portfolio in Q4 2024.
- Simplex Trading opened 1,520 new positions and closed 1,504 in Q4 2024.
- Simplex Trading's portfolio value rose 4.8% quarter-over-quarter to $179B.
Based on Simplex Trading's 13F filing for Q4 2024, filed 11 Feb 2025.