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 | |
|---|---|---|---|---|---|---|
6176
CALL
Babcock & Wilcox
BW
$1.41B
| $36K | ﹤0.01% |
18,100
-400
| -2% | -$568 |
|
6177
Cabaletta Bio
CABA
$444M
| $36K | ﹤0.01% |
7,638
+1,434
| +23% | +$8.3K |
|
6178
CALL
Covenant Logistics
CVLG
$928M
| $36K | ﹤0.01% |
1,400
-1,000
| -42% | -$25.9K |
|
6179
CALL
Douglas Emmett
DEI
$2.02B
| $36K | ﹤0.01% |
2,100
-49,400
| -96% | -$764K |
|
6180
CALL
Glacier Bancorp
GBCI
$6.38B
| $36K | ﹤0.01% |
800
+100
| +14% | +$4.32K |
|
|
IAS
6181
PUT
DELISTED
Integral Ad Science
IAS
| $36K | ﹤0.01% |
3,400
-9,000
| -73% | -$96.7K |
|
|
IMMP
6182
CALL
Immutep
IMMP
$56M
| $36K | ﹤0.01% |
+16,700
| New | +$36.8K |
|
6183
Ironwood Pharmaceuticals
IRWD
$614M
| $36K | ﹤0.01% |
+8,827
| New | +$47.5K |
|
6184
CALL
Lands' End
LE
$369M
| $36K | ﹤0.01% |
2,100
-11,100
| -84% | -$173K |
|
6185
PUT
Loop Industries
LOOP
$35.3M
| $36K | ﹤0.01% |
20,000
| – | – |
|
|
MSB
6186
CALL
Mesabi Trust
MSB
$301M
| $36K | ﹤0.01% |
1,600
+600
| +60% | +$11K |
|
|
NFGC
6187
New Found Gold
NFGC
$549M
| $36K | ﹤0.01% |
14,485
+12,028
| +490% | +$33K |
|
6188
nVent Electric
NVT
$23.4B
| $36K | ﹤0.01% |
526
-5,990
| -92% | -$413K |
|
6189
PUT
Phinia Inc
PHIN
$2.7B
| $36K | ﹤0.01% |
800
+500
| +167% | +$22.5K |
|
|
PINC
6190
PUT
DELISTED
Premier
PINC
| $36K | ﹤0.01% |
1,800
| – | – |
|
6191
PUT
Privia Health
PRVA
$3.01B
| $36K | ﹤0.01% |
2,000
-400
| -17% | -$7.63K |
|
6192
CALL
FreightCar America
RAIL
$261M
| $36K | ﹤0.01% |
3,400
+1,600
| +89% | +$9.33K |
|
6193
PUT
Relmada Therapeutics
RLMD
$562M
| $36K | ﹤0.01% |
11,200
+4,400
| +65% | +$14.3K |
|
6194
PUT
Rockwell Medical
RMTI
$28M
| $36K | ﹤0.01% |
+920
| New | +$24.8K |
|
6195
CALL
Smart Sand
SND
$179M
| $36K | ﹤0.01% |
18,300
-13,000
| -42% | -$26.8K |
|
6196
CALL
Sixth Street Specialty
TSLX
$1.64B
| $36K | ﹤0.01% |
1,800
-500
| -22% | -$10.5K |
|
6197
PUT
Voyager Therapeutics
VYGR
$189M
| $36K | ﹤0.01% |
6,200
-1,600
| -21% | -$11.6K |
|
|
WOW
6198
PUT
DELISTED
WideOpenWest
WOW
| $36K | ﹤0.01% |
7,000
-26,900
| -79% | -$143K |
|
6199
CALL
Select Water Solutions
WTTR
$2.26B
| $36K | ﹤0.01% |
3,300
-16,400
| -83% | -$180K |
|
6200
BBB Foods
TBBB
$4.85B
| $36K | ﹤0.01% |
1,201
+523
| +77% | +$14.7K |
|
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.