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 | |
|---|---|---|---|---|---|---|
951
CALL
International Flavors & Fragrances
IFF
$18.8B
| $11.5M | 0.01% |
109,600
+33,000
| +43% | +$3.29M |
|
952
iShares MSCI Brazil ETF
EWZ
$9.16B
| $11.5M | 0.01% |
389,145
-695,805
| -64% | -$20.2M |
|
|
MPT
953
CALL
Medical Properties Trust
MPT
$2.87B
| $11.4M | 0.01% |
1,954,300
-140,900
| -7% | -$695K |
|
954
PUT
Suncor Energy
SU
$78.4B
| $11.4M | 0.01% |
309,600
-92,600
| -23% | -$3.58M |
|
955
PUT
Generac Holdings
GNRC
$12.4B
| $11.4M | 0.01% |
71,900
-13,600
| -16% | -$2.02M |
|
956
PUT
Carpenter Technology
CRS
$29.9B
| $11.4M | 0.01% |
71,500
+23,300
| +48% | +$3.16M |
|
|
DOCU
957
PUT
DocuSign
DOCU
$8.98B
| $11.4M | 0.01% |
183,600
-14,800
| -7% | -$829K |
|
958
PUT
Lincoln National
LNC
$7.81B
| $11.4M | 0.01% |
361,400
+201,200
| +126% | +$6.27M |
|
959
CALL
Alamos Gold
AGI
$12.3B
| $11.4M | 0.01% |
570,900
-91,900
| -14% | -$1.69M |
|
960
CALL
KeyCorp
KEY
$24.4B
| $11.4M | 0.01% |
679,100
+235,500
| +53% | +$3.74M |
|
961
CALL
Crocs
CROX
$6.58B
| $11.4M | 0.01% |
78,400
-40,100
| -34% | -$5.47M |
|
962
Novavax
NVAX
$1.29B
| $11.4M | 0.01% |
898,820
+631,389
| +236% | +$8.15M |
|
963
PUT
Ralph Lauren
RL
$22.1B
| $11.3M | 0.01% |
58,500
-7,600
| -11% | -$1.31M |
|
964
CALL
Cardinal Health
CAH
$52.9B
| $11.3M | 0.01% |
102,300
-34,600
| -25% | -$3.62M |
|
965
PUT
Wolfspeed
WOLF
$1.35B
| $11.3M | 0.01% |
1,161,300
+557,900
| +92% | +$8.21M |
|
966
CALL
AerCap
AER
$23.4B
| $11.3M | 0.01% |
118,900
+71,200
| +149% | +$6.67M |
|
967
CALL
Hims & Hers Health
HIMS
$7.58B
| $11.3M | 0.01% |
610,900
-505,800
| -45% | -$9.06M |
|
968
PUT
Advance Auto Parts
AAP
$3.22B
| $11.2M | 0.01% |
288,500
+123,600
| +75% | +$6.55M |
|
969
PUT
Southern Company
SO
$109B
| $11.2M | 0.01% |
124,700
+35,200
| +39% | +$3.01M |
|
970
CALL
Aon
AON
$76B
| $11.2M | 0.01% |
32,400
-9,900
| -23% | -$3.24M |
|
971
PUT
Factset
FDS
$8.68B
| $11.2M | 0.01% |
24,300
+23,400
| +2,600% | +$9.94M |
|
972
CALL
VF Corp
VFC
$6.49B
| $11.2M | 0.01% |
559,500
+259,200
| +86% | +$4.34M |
|
973
CALL
Steel Dynamics
STLD
$34.7B
| $11.2M | 0.01% |
88,500
-12,300
| -12% | -$1.49M |
|
974
CALL
Lumen
LUMN
$6.73B
| $11.1M | 0.01% |
1,568,600
+1,112,600
| +244% | +$4.75M |
|
975
CALL
Cytokinetics
CYTK
$11.1B
| $11.1M | 0.01% |
210,900
+56,000
| +36% | +$3.12M |
|
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.