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 | |
|---|---|---|---|---|---|---|
2476
PUT
HF Sinclair
DINO
$15.9B
| $1.6M | ﹤0.01% |
35,900
+11,400
| +47% | +$544K |
|
2477
PUT
Evergy
EVRG
$20.1B
| $1.6M | ﹤0.01% |
25,800
-167,300
| -87% | -$9.73M |
|
2478
PUT
Weibo
WB
$1.9B
| $1.59M | ﹤0.01% |
158,000
-8,200
| -5% | -$64.5K |
|
2479
Nextpower Inc
NXT
$15.2B
| $1.59M | ﹤0.01% |
42,474
+20,985
| +98% | +$875K |
|
2480
Opendoor
OPEN
$3.7B
| $1.59M | ﹤0.01% |
822,266
+29,878
| +4% | +$60.6K |
|
2481
PUT
Alamos Gold
AGI
$12.4B
| $1.59M | ﹤0.01% |
79,700
-67,800
| -46% | -$1.24M |
|
2482
American International
AIG
$41.9B
| $1.59M | ﹤0.01% |
21,687
+11,267
| +108% | +$840K |
|
|
SNV
2483
PUT
DELISTED
Synovus
SNV
| $1.59M | ﹤0.01% |
35,700
-16,400
| -31% | -$717K |
|
2484
CALL
Invitation Homes
INVH
$17.7B
| $1.59M | ﹤0.01% |
45,000
-4,300
| -9% | -$154K |
|
|
OPTU
2485
Optimum Communications Inc
OPTU
$316M
| $1.58M | ﹤0.01% |
644,648
+432,337
| +204% | +$835K |
|
2486
PUT
IonQ
IONQ
$12.3B
| $1.58M | ﹤0.01% |
181,400
-8,400
| -4% | -$64K |
|
2487
PUT
Lufax Holding
LU
$1.2B
| $1.58M | ﹤0.01% |
454,200
+131,000
| +41% | +$343K |
|
2488
CALL
W.R. Berkley
WRB
$28B
| $1.58M | ﹤0.01% |
27,950
+21,050
| +305% | +$1.18M |
|
2489
LyondellBasell Industries
LYB
$19.5B
| $1.58M | ﹤0.01% |
+16,519
| New | +$1.58M |
|
2490
CALL
Calix
CALX
$2.27B
| $1.58M | ﹤0.01% |
40,800
+32,900
| +416% | +$1.21M |
|
2491
CALL
Liquidia Corp
LQDA
$7.67B
| $1.58M | ﹤0.01% |
157,900
+38,600
| +32% | +$422K |
|
2492
PUT
Teekay Tankers
TNK
$2.63B
| $1.58M | ﹤0.01% |
27,100
-12,800
| -32% | -$755K |
|
2493
PUT
Sibanye-Stillwater
SBSW
$5.92B
| $1.57M | ﹤0.01% |
383,400
-112,500
| -23% | -$477K |
|
2494
PUT
Asbury Automotive
ABG
$4.19B
| $1.57M | ﹤0.01% |
6,600
-3,800
| -37% | -$895K |
|
2495
CALL
CoreCivic
CXW
$3.1B
| $1.57M | ﹤0.01% |
124,400
-147,100
| -54% | -$1.96M |
|
2496
CALL
Huazhu Hotels Group
HTHT
$12.4B
| $1.57M | ﹤0.01% |
42,300
+7,700
| +22% | +$234K |
|
2497
PayPal
PYPL
$49.5B
| $1.57M | ﹤0.01% |
+20,162
| New | +$1.35M |
|
|
ENLC
2498
PUT
DELISTED
ENLINK MIDSTREAM, LLC
ENLC
| $1.57M | ﹤0.01% |
108,200
+106,400
| +5,911% | +$1.46M |
|
2499
Cigna
CI
$76.6B
| $1.57M | ﹤0.01% |
4,527
-8,332
| -65% | -$2.87M |
|
2500
PUT
GigaCloud Technology
GCT
$1.35B
| $1.57M | ﹤0.01% |
68,200
-32,700
| -32% | -$785K |
|
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.