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 | |
|---|---|---|---|---|---|---|
3701
Aurora
AUR
$12.2B
| $453K | ﹤0.01% |
76,639
+44,358
| +137% | +$185K |
|
3702
Ecopetrol
EC
$32.5B
| $453K | ﹤0.01% |
+50,821
| New | +$514K |
|
3703
CALL
Navient
NAVI
$809M
| $453K | ﹤0.01% |
29,100
+1,200
| +4% | +$18.5K |
|
3704
PUT
Packaging Corp of America
PKG
$22.5B
| $452K | ﹤0.01% |
2,100
-300
| -13% | -$59.6K |
|
3705
CALL
Broadridge
BR
$17.7B
| $451K | ﹤0.01% |
2,100
+800
| +62% | +$167K |
|
3706
CALL
Neonode
NEON
$12.9M
| $451K | ﹤0.01% |
49,600
+36,700
| +284% | +$186K |
|
3707
CALL
Build-A-Bear
BBW
$428M
| $450K | ﹤0.01% |
13,100
+2,700
| +26% | +$76.1K |
|
3708
CALL
Idaho Strategic Resources
IDR
$458M
| $449K | ﹤0.01% |
28,000
+14,600
| +109% | +$175K |
|
3709
PUT
SSR Mining
SSRM
$5.45B
| $448K | ﹤0.01% |
78,900
-11,000
| -12% | -$57.6K |
|
3710
PUT
AppFolio
APPF
$5.98B
| $447K | ﹤0.01% |
1,900
+1,400
| +280% | +$328K |
|
3711
PUT
Eastman Chemical
EMN
$7.74B
| $447K | ﹤0.01% |
4,000
-4,500
| -53% | -$450K |
|
3712
PUT
Ouster
OUST
$2.36B
| $447K | ﹤0.01% |
71,000
+12,100
| +21% | +$115K |
|
|
SAND
3713
DELISTED
Sandstorm Gold
SAND
| $447K | ﹤0.01% |
74,563
-3,168
| -4% | -$18K |
|
3714
Banc of California
BANC
$3.21B
| $446K | ﹤0.01% |
30,331
-11,276
| -27% | -$156K |
|
3715
CALL
BJ's Restaurants
BJRI
$1.45B
| $446K | ﹤0.01% |
13,700
+3,700
| +37% | +$119K |
|
3716
PUT
Inhibrx
INBX
$1.21B
| $446K | ﹤0.01% |
+28,500
| New | +$400K |
|
3717
PUT
Ardmore Shipping
ASC
$669M
| $445K | ﹤0.01% |
24,600
-10,600
| -30% | -$204K |
|
3718
CALL
MKS Inc
MKSI
$21.3B
| $445K | ﹤0.01% |
4,100
| – | – |
|
3719
CALL
Par Pacific Holdings
PARR
$3.94B
| $445K | ﹤0.01% |
25,300
-41,400
| -62% | -$925K |
|
3720
PUT
Portland General Electric
POR
$5.93B
| $445K | ﹤0.01% |
9,300
-1,500
| -14% | -$70.2K |
|
3721
CALL
C4 Therapeutics
CCCC
$397M
| $443K | ﹤0.01% |
77,800
-5,500
| -7% | -$33.1K |
|
|
BORR
3722
Borr Drilling
BORR
$1.27B
| $442K | ﹤0.01% |
80,657
-7,361
| -8% | -$45K |
|
3723
PUT
Allison Transmission
ALSN
$10.1B
| $441K | ﹤0.01% |
4,600
-2,400
| -34% | -$206K |
|
3724
CALL
Brookfield Infrastructure Partners
BIP
$18.6B
| $441K | ﹤0.01% |
12,600
-5,200
| -29% | -$163K |
|
3725
PUT
Harmonic Inc
HLIT
$1.23B
| $441K | ﹤0.01% |
30,300
+28,300
| +1,415% | +$378K |
|
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.