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 |
Boeing
BA
|
+$55.8M |
| 2 |
Microsoft
MSFT
|
+$42.2M |
| 3 |
Pinduoduo
PDD
|
+$41.3M |
| 4 |
Apple
AAPL
|
+$32M |
| 5 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$28.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Broadcom
AVGO
|
+$95.2M |
| 2 |
Citigroup
C
|
+$57.2M |
| 3 |
Pfizer
PFE
|
+$56.4M |
| 4 |
TSMC
TSM
|
+$39.7M |
| 5 |
Starbucks
SBUX
|
+$35.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.4% |
| 2 | Consumer Discretionary | 0.29% |
| 3 | Healthcare | 0.15% |
| 4 | Industrials | 0.13% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
5751
PUT
Mueller Industries
MLI
$14.7B
| $59K | ﹤0.01% |
1,600
+1,000
| +167% | +$33.5K |
|
5752
CALL
Mid Penn Bancorp
MPB
$971M
| $59K | ﹤0.01% |
+2,000
| New | +$54.6K |
|
5753
CALL
Oceaneering
OII
$4.86B
| $59K | ﹤0.01% |
2,400
-4,900
| -67% | -$126K |
|
|
SNCR
5754
CALL
DELISTED
Synchronoss Technologies
SNCR
| $59K | ﹤0.01% |
4,000
-1,100
| -22% | -$12.9K |
|
5755
CALL
VirTra
VTSI
$34.9M
| $59K | ﹤0.01% |
9,500
+2,900
| +44% | +$21.1K |
|
|
CCC
5756
CCC Intelligent Solutions
CCC
$3.59B
| $58K | ﹤0.01% |
+5,332
| New | +$57.5K |
|
5757
Cooper-Standard Automotive
CPS
$523M
| $58K | ﹤0.01% |
+4,199
| New | +$58.3K |
|
|
ETNB
5758
DELISTED
89bio
ETNB
| $58K | ﹤0.01% |
7,925
+5,870
| +286% | +$49.4K |
|
5759
Landstar System
LSTR
$5.93B
| $58K | ﹤0.01% |
+311
| New | +$57.4K |
|
|
STR
5760
PUT
DELISTED
Sitio Royalties
STR
| $58K | ﹤0.01% |
2,800
-1,800
| -39% | -$40.8K |
|
5761
CALL
TriNet
TNET
$3.02B
| $58K | ﹤0.01% |
600
-600
| -50% | -$59.7K |
|
|
YALA
5762
CALL
Yalla Group
YALA
$818M
| $58K | ﹤0.01% |
12,800
-3,800
| -23% | -$15.9K |
|
|
AIFU
5763
PUT
AIFU Inc
AIFU
$206M
| $58K | ﹤0.01% |
125
| – | – |
|
|
MKFG
5764
CALL
DELISTED
Markforged Holding Corporation
MKFG
| $58K | ﹤0.01% |
+12,300
| New | +$39.9K |
|
|
SDIG
5765
CALL
DELISTED
Stronghold Digital Mining, Inc. Class A Common Stock
SDIG
| $58K | ﹤0.01% |
11,600
+3,700
| +47% | +$14.6K |
|
5766
China Automotive Systems
CAAS
$136M
| $57K | ﹤0.01% |
12,469
+8,005
| +179% | +$29.9K |
|
5767
CALL
Eton Pharmaceutcials
ETON
$1.27B
| $57K | ﹤0.01% |
9,500
+700
| +8% | +$2.96K |
|
5768
PUT
GSI Technology
GSIT
$215M
| $57K | ﹤0.01% |
18,700
+17,700
| +1,770% | +$48.3K |
|
5769
PUT
Helmerich & Payne
HP
$3.45B
| $57K | ﹤0.01% |
1,900
-48,500
| -96% | -$1.68M |
|
5770
Lincoln Educational Services
LINC
$1.33B
| $57K | ﹤0.01% |
4,790
+1,450
| +43% | +$18K |
|
5771
LivaNova
LIVN
$4.4B
| $57K | ﹤0.01% |
1,093
-15,372
| -93% | -$762K |
|
5772
CALL
Metropolitan Bank Holding Corp
MCB
$1.15B
| $57K | ﹤0.01% |
1,100
-400
| -27% | -$19.8K |
|
5773
CALL
NMI Holdings
NMIH
$3.37B
| $57K | ﹤0.01% |
1,400
+900
| +180% | +$34.7K |
|
5774
Paysign
PAYS
$501M
| $57K | ﹤0.01% |
15,765
-3,880
| -20% | -$17.7K |
|
5775
CALL
Post Holdings
POST
$4.14B
| $57K | ﹤0.01% |
500
-200
| -29% | -$22.4K |
|
Similar funds
Simplex Trading's Q3 2024 Portfolio in Review
As of Q3 2024, Simplex Trading held 9,964 positions worth $170B, up 5.3% from $162B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q3 2024 filing shows 1,185 new, 3,232 increased, 3,829 reduced and 1,476 closed positions. Its largest new stake was Boeing: 325,328 shares worth $49.5M. The largest sale was Broadcom, an estimated $95.2M.
By sector, the portfolio is most concentrated in Technology at 0.4% of assets, down from 0.53% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2024 buy was Boeing: 325,328 shares worth $49.5M.
- Simplex Trading added most to Pinduoduo in Q3 2024, an estimated $41.3M increase.
- Simplex Trading's biggest Q3 2024 reduction was Citigroup, cutting an estimated $57.2M.
- Simplex Trading fully exited Broadcom in Q3 2024, selling an estimated $95.2M.
- Simplex Trading's ten largest holdings make up 50% of its $170B portfolio in Q3 2024.
- Simplex Trading opened 1,185 new positions and closed 1,476 in Q3 2024.
- Simplex Trading's portfolio value rose 5.3% quarter-over-quarter to $170B.
Based on Simplex Trading's 13F filing for Q3 2024, filed 8 Nov 2024.