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 | |
|---|---|---|---|---|---|---|
6426
PUT
Collegium Pharmaceutical
COLL
$1.18B
| $27K | ﹤0.01% |
+700
| New | +$25K |
|
|
CSGS
6427
DELISTED
CSG Systems International
CSGS
| $27K | ﹤0.01% |
562
-843
| -60% | -$38.4K |
|
6428
CALL
California Water Service
CWT
$3.1B
| $27K | ﹤0.01% |
500
+200
| +67% | +$10.6K |
|
6429
Dimensional US Core Equity Market ETF
DFAU
$12.1B
| $27K | ﹤0.01% |
+695
| New | +$26.5K |
|
6430
National Vision
EYE
$1.76B
| $27K | ﹤0.01% |
2,503
+884
| +55% | +$10.3K |
|
6431
PUT
First Commonwealth Financial
FCF
$2.2B
| $27K | ﹤0.01% |
+1,600
| New | +$26.2K |
|
6432
PUT
StealthGas
GASS
$326M
| $27K | ﹤0.01% |
4,000
-25,100
| -86% | -$163K |
|
6433
Gerdau
GGB
$9.54B
| $27K | ﹤0.01% |
7,890
-4,853
| -38% | -$15.9K |
|
|
GMS
6434
PUT
DELISTED
GMS Inc
GMS
| $27K | ﹤0.01% |
300
-100
| -25% | -$8.84K |
|
6435
PUT
GrowGeneration
GRWG
$84.7M
| $27K | ﹤0.01% |
12,800
+7,300
| +133% | +$15.7K |
|
6436
PUT
IHS Holding
IHS
$2.78B
| $27K | ﹤0.01% |
9,100
+7,100
| +355% | +$21.8K |
|
6437
Immunocore
IMCR
$1.7B
| $27K | ﹤0.01% |
+871
| New | +$31.7K |
|
6438
PUT
Innoviva
INVA
$1.6B
| $27K | ﹤0.01% |
1,400
-700
| -33% | -$12.9K |
|
|
JAMF
6439
PUT
DELISTED
Jamf
JAMF
| $27K | ﹤0.01% |
1,600
-5,800
| -78% | -$103K |
|
|
KC
6440
PUT
Kingsoft Cloud Holdings
KC
$2.96B
| $27K | ﹤0.01% |
9,400
-2,300
| -20% | -$5.69K |
|
|
TBHC
6441
DELISTED
The Brand House Collective
TBHC
| $27K | ﹤0.01% |
12,412
+5,314
| +75% | +$8.93K |
|
6442
Mistras Group
MG
$477M
| $27K | ﹤0.01% |
2,428
+1,705
| +236% | +$17.5K |
|
|
RDUS
6443
PUT
DELISTED
Radius Recycling
RDUS
| $27K | ﹤0.01% |
1,500
-1,200
| -44% | -$19.2K |
|
6444
CALL
Runway Growth Finance
RWAY
$235M
| $27K | ﹤0.01% |
2,700
-9,900
| -79% | -$109K |
|
6445
CALL
Sera Prognostics
SERA
$80.3M
| $27K | ﹤0.01% |
+3,500
| New | +$25.4K |
|
6446
CALL
Siebert Financial
SIEB
$65.9M
| $27K | ﹤0.01% |
+11,000
| New | +$20.1K |
|
|
TGI
6447
DELISTED
Triumph Group
TGI
| $27K | ﹤0.01% |
2,131
-455
| -18% | -$6.6K |
|
6448
CALL
Vivani Medical
VANI
$109M
| $27K | ﹤0.01% |
23,600
+16,500
| +232% | +$20.6K |
|
6449
Zegna
ZGN
$4.01B
| $27K | ﹤0.01% |
2,756
-2,160
| -44% | -$22.4K |
|
|
TBRG
6450
CALL
DELISTED
TruBridge
TBRG
| $27K | ﹤0.01% |
+2,300
| New | +$26.8K |
|
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.