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 | |
|---|---|---|---|---|---|---|
4576
Red Cat Holdings
RCAT
$1.03B
| $188K | ﹤0.01% |
74,289
+66,272
| +827% | +$158K |
|
4577
PUT
Wave Life Sciences
WVE
$1.12B
| $188K | ﹤0.01% |
23,000
+14,900
| +184% | +$89.1K |
|
|
CTLP
4578
DELISTED
Cantaloupe
CTLP
| $187K | ﹤0.01% |
25,285
-2,800
| -10% | -$19.2K |
|
4579
Freshworks
FRSH
$3.21B
| $187K | ﹤0.01% |
16,332
-78,956
| -83% | -$946K |
|
|
HIVE
4580
PUT
HIVE Digital Technologies
HIVE
$679M
| $187K | ﹤0.01% |
60,000
+22,500
| +60% | +$73.4K |
|
|
JBGS
4581
CALL
JBG SMITH
JBGS
$846M
| $187K | ﹤0.01% |
10,700
| – | – |
|
4582
PUT
Madison Square Garden
MSGS
$9.59B
| $187K | ﹤0.01% |
900
-5,600
| -86% | -$1.13M |
|
4583
Rambus
RMBS
$8.95B
| $187K | ﹤0.01% |
+4,450
| New | +$216K |
|
4584
CALL
The Bancorp
TBBK
$2.81B
| $187K | ﹤0.01% |
+3,500
| New | +$169K |
|
4585
CALL
Vanguard Total International Stock ETF
VXUS
$151B
| $187K | ﹤0.01% |
2,900
-3,500
| -55% | -$217K |
|
|
SWN
4586
CALL
DELISTED
Southwestern Energy Company
SWN
| $187K | ﹤0.01% |
528,700
-98,400
| -16% | -$635K |
|
4587
PUT
Bloomin' Brands
BLMN
$754M
| $186K | ﹤0.01% |
11,300
-3,900
| -26% | -$69.2K |
|
4588
CALL
3D Systems Corp
DDD
$405M
| $186K | ﹤0.01% |
65,500
-53,500
| -45% | -$154K |
|
4589
PUT
Global Partners
GLP
$1.65B
| $186K | ﹤0.01% |
4,000
+100
| +3% | +$4.24K |
|
4590
CALL
Rexford Industrial Realty
REXR
$8.63B
| $186K | ﹤0.01% |
+3,700
| New | +$184K |
|
4591
CALL
Collegium Pharmaceutical
COLL
$1.18B
| $185K | ﹤0.01% |
4,800
+3,900
| +433% | +$139K |
|
4592
DoubleVerify
DV
$1.77B
| $185K | ﹤0.01% |
11,010
-1,692
| -13% | -$32.3K |
|
|
DX
4593
PUT
Dynex Capital
DX
$3.17B
| $185K | ﹤0.01% |
14,500
+1,600
| +12% | +$19.8K |
|
4594
Napco Security Technologies
NSSC
$1.3B
| $185K | ﹤0.01% |
+4,594
| New | +$225K |
|
4595
PUT
Prothena Corp
PRTA
$448M
| $185K | ﹤0.01% |
11,100
+2,000
| +22% | +$43K |
|
4596
CALL
Highwoods Properties
HIW
$3.79B
| $184K | ﹤0.01% |
5,500
-19,100
| -78% | -$584K |
|
|
AMED
4597
CALL
DELISTED
Amedisys
AMED
| $183K | ﹤0.01% |
1,900
+200
| +12% | +$19.5K |
|
4598
loanDepot
LDI
$548M
| $183K | ﹤0.01% |
67,042
+59,531
| +793% | +$141K |
|
4599
CALL
PRA Group
PRAA
$672M
| $183K | ﹤0.01% |
8,200
+700
| +9% | +$15.6K |
|
|
RC
4600
Ready Capital
RC
$260M
| $183K | ﹤0.01% |
+23,986
| New | +$203K |
|
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.