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 | |
|---|---|---|---|---|---|---|
4426
CALL
Allison Transmission
ALSN
$9.51B
| $220K | ﹤0.01% |
2,300
+1,100
| +92% | +$94.3K |
|
4427
AMC Global Media
AMCX
$450M
| $220K | ﹤0.01% |
25,377
+2,062
| +9% | +$19.9K |
|
4428
PUT
HealthEquity
HQY
$8.71B
| $220K | ﹤0.01% |
2,700
-200
| -7% | -$15.4K |
|
4429
CALL
Revolve Group
RVLV
$1.85B
| $220K | ﹤0.01% |
8,900
+800
| +10% | +$16.8K |
|
4430
PUT
Polestar Automotive Holding UK
PSNY
$1.97B
| $219K | ﹤0.01% |
4,247
-1,266
| -23% | -$40.9K |
|
4431
Sempra
SRE
$58.1B
| $219K | ﹤0.01% |
+2,620
| New | +$210K |
|
4432
CALL
TFI International
TFII
$11.6B
| $219K | ﹤0.01% |
1,600
-5,600
| -78% | -$827K |
|
4433
CALL
Xeris Biopharma Holdings
XERS
$1.45B
| $219K | ﹤0.01% |
77,000
+5,400
| +8% | +$13.9K |
|
4434
Old National Bancorp
ONB
$10.2B
| $218K | ﹤0.01% |
11,726
+8,282
| +240% | +$155K |
|
4435
CALL
ReNew
RNW
$2.18B
| $218K | ﹤0.01% |
34,700
+24,000
| +224% | +$142K |
|
4436
CALL
Saia
SAIA
$10.5B
| $218K | ﹤0.01% |
500
-20,700
| -98% | -$8.77M |
|
4437
PUT
AnaptysBio
ANAB
$1.54B
| $217K | ﹤0.01% |
+6,500
| New | +$222K |
|
4438
PUT
EXL Service
EXLS
$5.5B
| $217K | ﹤0.01% |
5,700
-5,500
| -49% | -$192K |
|
4439
PUT
Inseego
INSG
$104M
| $217K | ﹤0.01% |
13,300
+10,200
| +329% | +$131K |
|
4440
PUT
Extra Space Storage
EXR
$32.3B
| $216K | ﹤0.01% |
1,200
-2,100
| -64% | -$354K |
|
|
FOLD
4441
DELISTED
Amicus Therapeutics
FOLD
| $216K | ﹤0.01% |
20,250
-54,345
| -73% | -$592K |
|
4442
CALL
Green Dot
GDOT
$750M
| $216K | ﹤0.01% |
18,500
-600
| -3% | -$6.27K |
|
|
ILPT
4443
CALL
Industrial Logistics Properties Trust
ILPT
$582M
| $216K | ﹤0.01% |
45,400
-11,800
| -21% | -$55.5K |
|
4444
Marriott Vacations Worldwide
VAC
$3.53B
| $216K | ﹤0.01% |
2,950
+1,600
| +119% | +$124K |
|
4445
Alector
ALEC
$169M
| $215K | ﹤0.01% |
46,344
+22,913
| +98% | +$123K |
|
4446
CALL
Alpha and Omega Semiconductor
AOSL
$829M
| $215K | ﹤0.01% |
5,800
-6,300
| -52% | -$239K |
|
4447
AngloGold Ashanti
AU
$39.4B
| $215K | ﹤0.01% |
+8,081
| New | +$232K |
|
4448
JFrog
FROG
$8.88B
| $215K | ﹤0.01% |
+7,427
| New | +$233K |
|
4449
PUT
Jones Lang LaSalle
JLL
$15.8B
| $215K | ﹤0.01% |
800
| – | – |
|
|
SCS
4450
CALL
DELISTED
Steelcase
SCS
| $215K | ﹤0.01% |
16,000
-6,400
| -29% | -$85.8K |
|
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.