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 | |
|---|---|---|---|---|---|---|
3576
CALL
Steris
STE
$21.3B
| $509K | ﹤0.01% |
2,100
-8,500
| -80% | -$1.99M |
|
3577
Ameren
AEE
$31B
| $507K | ﹤0.01% |
5,806
-1,699
| -23% | -$136K |
|
3578
CALL
ProShares UltraShort Industrials
SIJ
$5.69M
| $507K | ﹤0.01% |
5,600
+4,975
| +796% | +$184K |
|
|
BWIN
3579
CALL
Baldwin Insurance Group
BWIN
$2.67B
| $507K | ﹤0.01% |
10,200
+6,500
| +176% | +$283K |
|
|
CIO
3580
DELISTED
City Office REIT
CIO
| $506K | ﹤0.01% |
86,706
+2,210
| +3% | +$12.5K |
|
3581
PUT
ONE Gas
OGS
$5.02B
| $506K | ﹤0.01% |
6,800
-2,400
| -26% | -$165K |
|
3582
PUT
Shoals Technologies Group
SHLS
$1.57B
| $504K | ﹤0.01% |
90,000
-198,800
| -69% | -$1.19M |
|
3583
PUT
Huntington Ingalls Industries
HII
$11.4B
| $502K | ﹤0.01% |
1,900
-100
| -5% | -$26.5K |
|
3584
ICU Medical
ICUI
$4.04B
| $502K | ﹤0.01% |
2,758
+2,289
| +488% | +$339K |
|
3585
CALL
OppFi
OPFI
$804M
| $502K | ﹤0.01% |
106,200
+9,100
| +9% | +$37.8K |
|
3586
CALL
Jackson Financial
JXN
$8.44B
| $501K | ﹤0.01% |
5,500
+500
| +10% | +$41.7K |
|
3587
CALL
Reinsurance Group of America
RGA
$15.7B
| $501K | ﹤0.01% |
2,300
+2,000
| +667% | +$425K |
|
3588
CALL
Full Truck Alliance
YMM
$9.66B
| $501K | ﹤0.01% |
55,700
-1,200
| -2% | -$9.21K |
|
3589
First Financial Bankshares
FFIN
$4.94B
| $500K | ﹤0.01% |
13,530
+6,740
| +99% | +$238K |
|
|
SRCL
3590
PUT
DELISTED
Stericycle Inc
SRCL
| $500K | ﹤0.01% |
8,200
+1,100
| +15% | +$65.3K |
|
3591
PUT
Corsair Gaming
CRSR
$1.13B
| $499K | ﹤0.01% |
71,700
-2,300
| -3% | -$17.2K |
|
3592
CALL
Trex
TREX
$4.57B
| $499K | ﹤0.01% |
7,500
-29,100
| -80% | -$2.04M |
|
3593
CALL
Nordson
NDSN
$16.6B
| $498K | ﹤0.01% |
1,900
+1,000
| +111% | +$244K |
|
3594
CALL
nVent Electric
NVT
$24.1B
| $498K | ﹤0.01% |
7,100
+300
| +4% | +$20.7K |
|
3595
PUT
Rogers Communications
RCI
$17.7B
| $498K | ﹤0.01% |
12,400
-9,900
| -44% | -$388K |
|
3596
CALL
SiteOne Landscape Supply
SITE
$4.49B
| $498K | ﹤0.01% |
3,300
-600
| -15% | -$82.3K |
|
|
CMA
3597
DELISTED
Comerica
CMA
| $497K | ﹤0.01% |
+8,302
| New | +$458K |
|
|
ETWO
3598
CALL
DELISTED
E2open Parent Holdings
ETWO
| $497K | ﹤0.01% |
112,700
+90,000
| +396% | +$394K |
|
3599
PUT
Photronics
PLAB
$1.76B
| $497K | ﹤0.01% |
20,100
-6,800
| -25% | -$164K |
|
3600
CALL
ARS Pharmaceuticals
SPRY
$572M
| $497K | ﹤0.01% |
34,300
-93,300
| -73% | -$1.11M |
|
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.