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 | |
|---|---|---|---|---|---|---|
3801
CALL
Perion Network
PERI
$378M
| $415K | ﹤0.01% |
52,700
-29,500
| -36% | -$247K |
|
3802
Comstock Resources
CRK
$3.83B
| $414K | ﹤0.01% |
+37,228
| New | +$382K |
|
3803
CALL
Factset
FDS
$10B
| $413K | ﹤0.01% |
900
-3,200
| -78% | -$1.36M |
|
3804
CALL
Inseego
INSG
$108M
| $413K | ﹤0.01% |
25,300
+20,500
| +427% | +$264K |
|
3805
PUT
Nokia
NOK
$48.7B
| $413K | ﹤0.01% |
94,600
-55,900
| -37% | -$226K |
|
3806
PUT
Triumph Financial Inc
TFIN
$1.8B
| $413K | ﹤0.01% |
5,200
+100
| +2% | +$8.35K |
|
3807
CALL
Azenta
AZTA
$1.32B
| $411K | ﹤0.01% |
8,500
-3,900
| -31% | -$203K |
|
3808
PUT
Gen Digital
GEN
$16.4B
| $411K | ﹤0.01% |
15,000
-90,100
| -86% | -$2.31M |
|
3809
CALL
Fortive
FTV
$19.7B
| $410K | ﹤0.01% |
6,900
-39,545
| -85% | -$2.18M |
|
3810
PUT
Prospect Capital
PSEC
$1.11B
| $410K | ﹤0.01% |
76,700
-36,700
| -32% | -$195K |
|
3811
PUT
Alight
ALIT
$531M
| $409K | ﹤0.01% |
2,770
-3,575
| -56% | -$513K |
|
3812
CALL
Insight Enterprises
NSIT
$3.71B
| $409K | ﹤0.01% |
1,900
+1,800
| +1,800% | +$371K |
|
3813
Coursera
COUR
$1.67B
| $408K | ﹤0.01% |
51,500
+24,066
| +88% | +$190K |
|
3814
CALL
EnerSys
ENS
$6.61B
| $408K | ﹤0.01% |
4,000
+100
| +3% | +$10.1K |
|
3815
PUT
Flowers Foods
FLO
$1.68B
| $408K | ﹤0.01% |
17,700
+2,000
| +13% | +$45.4K |
|
3816
PUT
Smith & Wesson
SWBI
$668M
| $408K | ﹤0.01% |
31,500
+25,800
| +453% | +$373K |
|
3817
CALL
World Kinect Corp
WKC
$2.07B
| $408K | ﹤0.01% |
13,200
+3,800
| +40% | +$105K |
|
|
LSEA
3818
PUT
DELISTED
Landsea Homes
LSEA
| $407K | ﹤0.01% |
33,000
-20,900
| -39% | -$238K |
|
3819
PUT
Olin
OLN
$2.53B
| $407K | ﹤0.01% |
8,500
+4,700
| +124% | +$209K |
|
3820
Rocket Lab Corp
RKLB
$38.3B
| $407K | ﹤0.01% |
41,831
-62,017
| -60% | -$376K |
|
|
BECN
3821
CALL
DELISTED
Beacon Roofing Supply, Inc.
BECN
| $406K | ﹤0.01% |
4,700
+4,100
| +683% | +$365K |
|
3822
JetBlue
JBLU
$2.04B
| $405K | ﹤0.01% |
61,767
+45,356
| +276% | +$255K |
|
3823
CALL
Snap-on
SNA
$21.7B
| $405K | ﹤0.01% |
1,400
+600
| +75% | +$165K |
|
3824
Transmedics
TMDX
$2.6B
| $405K | ﹤0.01% |
2,583
-2,188
| -46% | -$337K |
|
3825
PUT
Raymond James Financial
RJF
$33.8B
| $404K | ﹤0.01% |
3,300
-7,300
| -69% | -$853K |
|
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.