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 | |
|---|---|---|---|---|---|---|
|
HOOK
5801
CALL
DELISTED
HOOKIPA Pharma
HOOK
| $55K | ﹤0.01% |
12,800
+10,360
| +425% | +$54.7K |
|
5802
Inovio Pharmaceuticals
INO
$55.7M
| $55K | ﹤0.01% |
9,671
+6,617
| +217% | +$54.6K |
|
5803
Intrepid Potash
IPI
$456M
| $55K | ﹤0.01% |
2,329
+699
| +43% | +$16.6K |
|
5804
PUT
Larimar Therapeutics
LRMR
$397M
| $55K | ﹤0.01% |
8,400
+2,000
| +31% | +$16.1K |
|
5805
CALL
uniQure
QURE
$3.03B
| $55K | ﹤0.01% |
11,200
-99,300
| -90% | -$647K |
|
5806
CALL
Radian Group
RDN
$5.18B
| $55K | ﹤0.01% |
1,600
-7,100
| -82% | -$246K |
|
5807
PUT
Rollins
ROL
$18.3B
| $55K | ﹤0.01% |
1,100
-5,100
| -82% | -$252K |
|
5808
PUT
ReposiTrak
TRAK
$153M
| $55K | ﹤0.01% |
3,000
| – | – |
|
5809
CALL
Fortress Biotech
FBIO
$104M
| $54K | ﹤0.01% |
+37,500
| New | +$71.4K |
|
5810
Flowers Foods
FLO
$1.49B
| $54K | ﹤0.01% |
+2,373
| New | +$53.9K |
|
5811
CALL
First Internet Bancorp
INBK
$257M
| $54K | ﹤0.01% |
1,600
-400
| -20% | -$13.5K |
|
|
PCH
5812
CALL
DELISTED
PotlatchDeltic
PCH
| $54K | ﹤0.01% |
1,200
+500
| +71% | +$21.2K |
|
5813
Perdoceo Education
PRDO
$1.99B
| $54K | ﹤0.01% |
2,451
+1,751
| +250% | +$39.4K |
|
5814
PUT
Rayonier
RYN
$6.55B
| $54K | ﹤0.01% |
1,874
+662
| +55% | +$18.1K |
|
|
SHCO
5815
PUT
DELISTED
Soho House & Co
SHCO
| $54K | ﹤0.01% |
10,700
+2,500
| +30% | +$13.7K |
|
5816
CALL
TransAlta
TAC
$3.95B
| $54K | ﹤0.01% |
5,300
-3,300
| -38% | -$27.4K |
|
5817
CALL
Veru
VERU
$36M
| $54K | ﹤0.01% |
7,140
+290
| +4% | +$2.5K |
|
5818
PUT
VirTra
VTSI
$34.9M
| $54K | ﹤0.01% |
8,700
+1,700
| +24% | +$12.4K |
|
|
NAGE
5819
PUT
Niagen Bioscience
NAGE
$271M
| $54K | ﹤0.01% |
15,000
-8,100
| -35% | -$25.5K |
|
|
SUM
5820
CALL
DELISTED
Summit Materials, Inc. Class A Common Stock
SUM
| $54K | ﹤0.01% |
1,400
-2,900
| -67% | -$111K |
|
|
USAP
5821
PUT
DELISTED
Universal Stainless & Alloy
USAP
| $54K | ﹤0.01% |
1,400
+200
| +17% | +$7.13K |
|
|
AMRN
5822
CALL
Amarin Corp
AMRN
$299M
| $53K | ﹤0.01% |
4,305
-1,325
| -24% | -$17.6K |
|
5823
Avient
AVNT
$3.33B
| $53K | ﹤0.01% |
1,068
+781
| +272% | +$35.8K |
|
5824
BARK
BARK
$81.8M
| $53K | ﹤0.01% |
1,639
-1,770
| -52% | -$57.6K |
|
5825
CALL
Erie Indemnity
ERIE
$12.7B
| $53K | ﹤0.01% |
100
-1,700
| -94% | -$774K |
|
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.