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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
6451
PUT
Myriad Genetics
MYGN
$476M
| $34K | ﹤0.01% |
+1,800
| New | +$31.1K |
|
6452
Ocugen
OCGN
$403M
| $34K | ﹤0.01% |
60,606
-8,886
| -13% | -$3.56K |
|
6453
PUT
Omeros
OMER
$845M
| $34K | ﹤0.01% |
10,700
-80,800
| -88% | -$171K |
|
6454
PUT
Pegasystems
PEGA
$5.09B
| $34K | ﹤0.01% |
1,400
-3,000
| -68% | -$70.2K |
|
|
PRO
6455
DELISTED
PROS Holdings
PRO
| $34K | ﹤0.01% |
+882
| New | +$31.7K |
|
6456
PUT
Runway Growth Finance
RWAY
$235M
| $34K | ﹤0.01% |
2,700
+500
| +23% | +$6.25K |
|
6457
CALL
Supernus Pharmaceuticals
SUPN
$2.7B
| $34K | ﹤0.01% |
1,200
+1,100
| +1,100% | +$29.2K |
|
|
TSVT
6458
DELISTED
2seventy bio
TSVT
| $34K | ﹤0.01% |
8,097
+7,915
| +4,349% | +$24.3K |
|
6459
CALL
Wolverine World Wide
WWW
$1.68B
| $34K | ﹤0.01% |
3,900
-3,400
| -47% | -$28.9K |
|
6460
Zevra Therapeutics
ZVRA
$578M
| $34K | ﹤0.01% |
+5,231
| New | +$24.5K |
|
|
BMTX
6461
PUT
DELISTED
BM Technologies, Inc.
BMTX
| $34K | ﹤0.01% |
+16,800
| New | +$43.5K |
|
|
MACK
6462
PUT
DELISTED
Merrimack Pharmaceuticals, Inc.
MACK
| $34K | ﹤0.01% |
2,600
+2,000
| +333% | +$25.3K |
|
6463
Ashland
ASH
$3.34B
| $33K | ﹤0.01% |
+395
| New | +$31.3K |
|
|
BAND
6464
PUT
Bandwidth Inc
BAND
$1.18B
| $33K | ﹤0.01% |
2,300
+1,800
| +360% | +$21K |
|
|
BELFB
6465
CALL
Bel Fuse Inc Class B
BELFB
$3.45B
| $33K | ﹤0.01% |
500
-300
| -38% | -$16.1K |
|
6466
DMC Global
BOOM
$111M
| $33K | ﹤0.01% |
1,793
+526
| +42% | +$9.67K |
|
6467
PUT
BlueLinx
BXC
$430M
| $33K | ﹤0.01% |
300
-1,600
| -84% | -$139K |
|
6468
State Street SPDR Bloomberg Convertible Securities ETF
CWB
$5.41B
| $33K | ﹤0.01% |
466
-1,607
| -78% | -$109K |
|
6469
PUT
Daktronics
DAKT
$946M
| $33K | ﹤0.01% |
4,000
+3,600
| +900% | +$34.4K |
|
6470
PUT
G-III Apparel Group
GIII
$1.54B
| $33K | ﹤0.01% |
1,000
-15,200
| -94% | -$428K |
|
|
GREK
6471
Global X MSCI Greece ETF
GREK
$293M
| $33K | ﹤0.01% |
+906
| New | +$32K |
|
6472
Global Water Resources
GWRS
$215M
| $33K | ﹤0.01% |
+2,533
| New | +$28.5K |
|
6473
PUT
Immersion
IMMR
$243M
| $33K | ﹤0.01% |
4,800
+4,100
| +586% | +$27.2K |
|
6474
PUT
Kinetik
KNTK
$3.72B
| $33K | ﹤0.01% |
+1,000
| New | +$34.9K |
|
6475
LivePerson
LPSN
$22M
| $33K | ﹤0.01% |
589
+563
| +2,165% | +$25.9K |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.