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 | |
|---|---|---|---|---|---|---|
|
DFS
1926
CALL
DELISTED
Discover Financial Services
DFS
| $2.99M | ﹤0.01% |
21,300
+4,500
| +27% | +$605K |
|
1927
Hilton Worldwide
HLT
$74B
| $2.99M | ﹤0.01% |
12,966
+62
| +0.5% | +$13.4K |
|
1928
CALL
Onto Innovation
ONTO
$13.6B
| $2.99M | ﹤0.01% |
14,400
+8,600
| +148% | +$1.74M |
|
1929
PUT
Immersion
IMMR
$216M
| $2.98M | ﹤0.01% |
334,600
-39,300
| -11% | -$400K |
|
1930
CALL
Cirrus Logic
CRUS
$6.74B
| $2.98M | ﹤0.01% |
24,000
-8,400
| -26% | -$1.11M |
|
|
JWN
1931
PUT
DELISTED
Nordstrom
JWN
| $2.98M | ﹤0.01% |
132,400
-146,800
| -53% | -$3.26M |
|
1932
CALL
Sturm, Ruger & Co
RGR
$610M
| $2.97M | ﹤0.01% |
71,300
+32,700
| +85% | +$1.38M |
|
1933
CALL
Lennox International
LII
$18.8B
| $2.96M | ﹤0.01% |
4,900
+2,100
| +75% | +$1.2M |
|
1934
PUT
EPR Properties
EPR
$4.86B
| $2.96M | ﹤0.01% |
60,300
+7,800
| +15% | +$356K |
|
1935
CALL
Uranium Energy
UEC
$4.71B
| $2.96M | ﹤0.01% |
476,200
-353,200
| -43% | -$1.92M |
|
1936
PUT
Stride
LRN
$3.69B
| $2.95M | ﹤0.01% |
34,600
-15,500
| -31% | -$1.2M |
|
1937
CALL
Corebridge Financial
CRBG
$14.1B
| $2.95M | ﹤0.01% |
101,200
+82,800
| +450% | +$2.34M |
|
1938
Mativ Holdings
MATV
$448M
| $2.95M | ﹤0.01% |
173,618
+86,352
| +99% | +$1.52M |
|
|
DAY
1939
CALL
DELISTED
Dayforce
DAY
| $2.95M | ﹤0.01% |
48,100
+12,500
| +35% | +$689K |
|
1940
CALL
Elanco Animal Health
ELAN
$12.4B
| $2.94M | ﹤0.01% |
200,500
-136,500
| -41% | -$1.9M |
|
|
NOVA
1941
CALL
DELISTED
Sunnova Energy
NOVA
| $2.94M | ﹤0.01% |
302,300
-147,600
| -33% | -$1.3M |
|
1942
CALL
Jack in the Box
JACK
$278M
| $2.94M | ﹤0.01% |
63,200
-2,000
| -3% | -$100K |
|
1943
CALL
Under Armour Class C
UA
$2.92B
| $2.94M | ﹤0.01% |
344,500
-15,700
| -4% | -$113K |
|
1944
CALL
Summit Therapeutics
SMMT
$10.9B
| $2.94M | ﹤0.01% |
134,200
+9,900
| +8% | +$138K |
|
1945
CALL
Pentair
PNR
$10.2B
| $2.93M | ﹤0.01% |
30,000
-4,700
| -14% | -$402K |
|
1946
CALL
ATI
ATI
$27B
| $2.93M | ﹤0.01% |
43,800
+17,700
| +68% | +$1.1M |
|
1947
PUT
TD Synnex
SNX
$19.4B
| $2.93M | ﹤0.01% |
24,400
+18,300
| +300% | +$2.12M |
|
1948
BWX Technologies
BWXT
$16B
| $2.92M | ﹤0.01% |
26,917
+16,275
| +153% | +$1.62M |
|
1949
CALL
Axcelis
ACLS
$4.12B
| $2.91M | ﹤0.01% |
27,800
-1,400
| -5% | -$164K |
|
1950
Wolverine World Wide
WWW
$1.54B
| $2.91M | ﹤0.01% |
167,017
+136,650
| +450% | +$1.89M |
|
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.