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 | |
|---|---|---|---|---|---|---|
|
FLNA
1501
CALL
Filana Therapeutics
FLNA
$43M
| $4.89M | ﹤0.01% |
166,300
+68,100
| +69% | +$1.57M |
|
1502
Expeditors International
EXPD
$22.9B
| $4.89M | ﹤0.01% |
37,232
+33,966
| +1,040% | +$4.16M |
|
1503
PUT
Southern Copper
SCCO
$141B
| $4.88M | ﹤0.01% |
44,820
-39,021
| -47% | -$3.84M |
|
1504
CALL
Insmed
INSM
$23.2B
| $4.88M | ﹤0.01% |
66,800
-64,200
| -49% | -$4.74M |
|
1505
CALL
Allstate
ALL
$66.9B
| $4.87M | ﹤0.01% |
25,700
-300
| -1% | -$53.3K |
|
1506
PUT
Groupon
GRPN
$980M
| $4.87M | ﹤0.01% |
498,400
+163,100
| +49% | +$2.19M |
|
1507
PUT
Evolent Health
EVH
$475M
| $4.85M | ﹤0.01% |
171,400
+119,800
| +232% | +$3.09M |
|
1508
PUT
Antero Resources
AR
$10.9B
| $4.84M | ﹤0.01% |
169,000
-70,100
| -29% | -$1.99M |
|
1509
PUT
Moody's
MCO
$82.4B
| $4.84M | ﹤0.01% |
10,200
+4,300
| +73% | +$1.99M |
|
1510
Eli Lilly
LLY
$1.07T
| $4.82M | ﹤0.01% |
+5,445
| New | +$4.9M |
|
1511
PUT
Norfolk Southern
NSC
$78.8B
| $4.82M | ﹤0.01% |
19,400
-2,900
| -13% | -$695K |
|
1512
Macy's
M
$6.15B
| $4.82M | ﹤0.01% |
+306,960
| New | +$4.99M |
|
1513
PUT
STMicroelectronics
STM
$46B
| $4.81M | ﹤0.01% |
161,800
+4,400
| +3% | +$145K |
|
|
IPG
1514
CALL
DELISTED
Interpublic Group of Companies
IPG
| $4.81M | ﹤0.01% |
152,000
+140,700
| +1,245% | +$4.32M |
|
1515
PUT
Ciena
CIEN
$55.3B
| $4.8M | ﹤0.01% |
77,900
-10,900
| -12% | -$574K |
|
1516
CALL
Cracker Barrel
CBRL
$1.2B
| $4.79M | ﹤0.01% |
105,700
+35,700
| +51% | +$1.47M |
|
|
ACB
1517
PUT
Aurora Cannabis
ACB
$165M
| $4.79M | ﹤0.01% |
814,000
-224,600
| -22% | -$1.33M |
|
1518
PUT
Vanguard Short-Term Treasury ETF
VGSH
$29.3B
| $4.77M | ﹤0.01% |
76,200
+14,100
| +23% | +$826K |
|
1519
CALL
Alpha Metallurgical Resources
AMR
$1.82B
| $4.77M | ﹤0.01% |
20,200
-2,900
| -13% | -$741K |
|
1520
PUT
Solventum
SOLV
$13.5B
| $4.77M | ﹤0.01% |
68,400
+62,600
| +1,079% | +$3.76M |
|
1521
CALL
Brown & Brown
BRO
$22.9B
| $4.76M | ﹤0.01% |
46,000
+39,100
| +567% | +$3.89M |
|
1522
PUT
Winnebago Industries
WGO
$870M
| $4.76M | ﹤0.01% |
82,000
+48,700
| +146% | +$2.79M |
|
|
FYBR
1523
CALL
DELISTED
Frontier Communications
FYBR
| $4.76M | ﹤0.01% |
134,100
+10,900
| +9% | +$328K |
|
1524
CALL
Sphere Entertainment
SPHR
$4.88B
| $4.75M | ﹤0.01% |
107,600
-10,500
| -9% | -$452K |
|
1525
CALL
Dentsply Sirona
XRAY
$2.59B
| $4.75M | ﹤0.01% |
175,600
+159,900
| +1,018% | +$4.08M |
|
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.