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 | |
|---|---|---|---|---|---|---|
3376
CALL
Dycom Industries
DY
$12.7B
| $611K | ﹤0.01% |
3,100
-7,400
| -70% | -$1.34M |
|
3377
PUT
Northern Oil and Gas
NOG
$2.21B
| $609K | ﹤0.01% |
17,200
+6,600
| +62% | +$252K |
|
3378
CALL
Tucows
TCX
$95.5M
| $609K | ﹤0.01% |
29,200
+8,500
| +41% | +$185K |
|
3379
PUT
Telephone and Data Systems
TDS
$3.83B
| $609K | ﹤0.01% |
26,200
-50,800
| -66% | -$1.11M |
|
3380
CALL
Veeco
VECO
$2.96B
| $609K | ﹤0.01% |
18,400
-700
| -4% | -$26.2K |
|
|
AMED
3381
PUT
DELISTED
Amedisys
AMED
| $608K | ﹤0.01% |
6,300
| – | – |
|
3382
Comfort Systems
FIX
$60.9B
| $608K | ﹤0.01% |
1,560
+373
| +31% | +$123K |
|
|
GTLS
3383
CALL
DELISTED
Chart Industries
GTLS
| $608K | ﹤0.01% |
4,900
-1,500
| -23% | -$197K |
|
3384
Nabors Industries
NBR
$1.16B
| $608K | ﹤0.01% |
9,434
+8,736
| +1,252% | +$674K |
|
3385
PUT
Sociedad Química y Minera de Chile
SQM
$19.6B
| $608K | ﹤0.01% |
14,600
-10,500
| -42% | -$402K |
|
3386
Royal Gold
RGLD
$17.1B
| $607K | ﹤0.01% |
4,327
-20,594
| -83% | -$2.82M |
|
|
ALTM
3387
DELISTED
Arcadium Lithium plc
ALTM
| $607K | ﹤0.01% |
213,041
+155,244
| +269% | +$449K |
|
3388
CALL
CACI
CACI
$11B
| $605K | ﹤0.01% |
1,200
+900
| +300% | +$417K |
|
3389
CALL
Utz Brands
UTZ
$1.25B
| $605K | ﹤0.01% |
34,200
+1,900
| +6% | +$31.6K |
|
3390
PUT
American Coastal Insurance
ACIC
$505M
| $604K | ﹤0.01% |
53,600
-66,900
| -56% | -$748K |
|
3391
CALL
Brookfield Renewable
BEPC
$5.95B
| $604K | ﹤0.01% |
18,500
-30,400
| -62% | -$882K |
|
3392
Douglas Emmett
DEI
$2.03B
| $604K | ﹤0.01% |
34,396
+15,344
| +81% | +$237K |
|
3393
CALL
The Ensign Group
ENSG
$10.4B
| $604K | ﹤0.01% |
4,200
+3,500
| +500% | +$499K |
|
3394
PUT
Payoneer
PAYO
$2.41B
| $603K | ﹤0.01% |
80,100
-200,100
| -71% | -$1.3M |
|
3395
PUT
SIGA Technologies
SIGA
$222M
| $603K | ﹤0.01% |
89,400
-4,700
| -5% | -$41K |
|
|
TRTX
3396
PUT
TPG RE Finance Trust
TRTX
$662M
| $601K | ﹤0.01% |
70,500
+1,500
| +2% | +$13.2K |
|
|
CHCT
3397
PUT
Community Healthcare Trust
CHCT
$538M
| $600K | ﹤0.01% |
33,100
+32,000
| +2,909% | +$654K |
|
3398
PUT
Commault Systems
CVLT
$6.19B
| $600K | ﹤0.01% |
3,900
+2,600
| +200% | +$366K |
|
3399
Dominion Energy
D
$61.8B
| $600K | ﹤0.01% |
+10,399
| New | +$568K |
|
|
HIMX
3400
PUT
Himax Technologies
HIMX
$2.22B
| $600K | ﹤0.01% |
109,100
+8,700
| +9% | +$55.1K |
|
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.