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 | |
|---|---|---|---|---|---|---|
6676
PUT
uniQure
QURE
$2.75B
| $20K | ﹤0.01% |
4,200
-117,400
| -97% | -$764K |
|
6677
The RealReal
REAL
$1.41B
| $20K | ﹤0.01% |
6,527
-88,684
| -93% | -$267K |
|
|
RGLS
6678
PUT
DELISTED
Regulus Therapeutics
RGLS
| $20K | ﹤0.01% |
12,900
-2,100
| -14% | -$3.47K |
|
6679
PUT
State Street Multi-Asset Real Return ETF
RLY
$1.26B
| $20K | ﹤0.01% |
+500
| New | +$14K |
|
6680
PUT
Sanmina
SANM
$8.78B
| $20K | ﹤0.01% |
300
-4,500
| -94% | -$311K |
|
|
SEVN
6681
PUT
Seven Hills Realty Trust
SEVN
$173M
| $20K | ﹤0.01% |
+1,500
| New | +$20.2K |
|
|
BNKK
6682
Bonk Inc
BNKK
$7.7M
| $20K | ﹤0.01% |
479
+201
| +72% | +$7.04K |
|
6683
CALL
Sensus Healthcare
SRTS
$46.9M
| $20K | ﹤0.01% |
3,500
+2,600
| +289% | +$15.8K |
|
6684
Sasol
SSL
$7.4B
| $20K | ﹤0.01% |
3,043
+1,278
| +72% | +$9.48K |
|
|
TBIL
6685
F/m US Treasury 3 Month Bill Fund
TBIL
$7.19B
| $20K | ﹤0.01% |
+400
| New | +$20K |
|
6686
Viridian Therapeutics
VRDN
$2.2B
| $20K | ﹤0.01% |
+911
| New | +$14.9K |
|
|
NARI
6687
PUT
DELISTED
Inari Medical, Inc. Common Stock
NARI
| $20K | ﹤0.01% |
500
-800
| -62% | -$38.4K |
|
|
AXNX
6688
PUT
DELISTED
Axonics, Inc. Common Stock
AXNX
| $20K | ﹤0.01% |
300
-200
| -40% | -$13.7K |
|
|
ML
6689
PUT
DELISTED
MoneyLion Inc.
ML
| $20K | ﹤0.01% |
500
-46,700
| -99% | -$2.53M |
|
6690
Airgain
AIRG
$71.1M
| $19K | ﹤0.01% |
2,645
-6,435
| -71% | -$45.8K |
|
6691
PUT
Arlo Technologies
ARLO
$1.58B
| $19K | ﹤0.01% |
1,600
-500
| -24% | -$6.62K |
|
6692
PUT
Avista
AVA
$3.43B
| $19K | ﹤0.01% |
500
+300
| +150% | +$11.3K |
|
6693
CALL
Avanos Medical
AVNS
| $19K | ﹤0.01% |
800
-200
| -20% | -$4.57K |
|
6694
PUT
Bain Capital Specialty
BCSF
$821M
| $19K | ﹤0.01% |
1,200
+1,100
| +1,100% | +$18.2K |
|
6695
PUT
DMC Global
BOOM
$111M
| $19K | ﹤0.01% |
1,500
-1,700
| -53% | -$21.5K |
|
6696
PUT
CNA Financial
CNA
$14.9B
| $19K | ﹤0.01% |
400
| – | – |
|
6697
Amplify Seymour Cannabis ETF
CNBS
$67.7M
| $19K | ﹤0.01% |
359
+329
| +1,097% | +$17.6K |
|
6698
PC Connection
CNXN
$2.09B
| $19K | ﹤0.01% |
260
+55
| +27% | +$3.82K |
|
6699
CALL
Caribou Biosciences
CRBU
$146M
| $19K | ﹤0.01% |
+9,800
| New | +$20.1K |
|
6700
CALL
DLH Holdings
DLHC
$78.3M
| $19K | ﹤0.01% |
2,100
-2,600
| -55% | -$27.4K |
|
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.