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 | |
|---|---|---|---|---|---|---|
2901
CALL
Credit Acceptance
CACC
$6B
| $1.02M | ﹤0.01% |
2,300
+300
| +15% | +$147K |
|
2902
CALL
Knife River
KNF
$4.43B
| $1.02M | ﹤0.01% |
11,400
+1,200
| +12% | +$93.7K |
|
2903
Vanguard High Dividend Yield ETF
VYM
$81.1B
| $1.02M | ﹤0.01% |
7,944
+3,877
| +95% | +$479K |
|
|
AMED
2904
DELISTED
Amedisys
AMED
| $1.02M | ﹤0.01% |
10,545
+2,112
| +25% | +$206K |
|
2905
CALL
Bloomin' Brands
BLMN
$680M
| $1.01M | ﹤0.01% |
61,300
+30,400
| +98% | +$539K |
|
2906
PUT
Freedom Holding
FRHC
$9.61B
| $1.01M | ﹤0.01% |
10,700
-2,000
| -16% | -$174K |
|
|
DM
2907
PUT
DELISTED
Desktop Metal, Inc.
DM
| $1.01M | ﹤0.01% |
216,800
-1,982,900
| -90% | -$9.1M |
|
2908
PUT
Aehr Test Systems
AEHR
$2.48B
| $1.01M | ﹤0.01% |
78,700
+3,500
| +5% | +$50.6K |
|
2909
CALL
Smith & Wesson
SWBI
$655M
| $1.01M | ﹤0.01% |
77,900
-10,600
| -12% | -$153K |
|
2910
CALL
Unum
UNM
$13.8B
| $1.01M | ﹤0.01% |
17,000
+300
| +2% | +$16.3K |
|
2911
CALL
Ionis Pharmaceuticals
IONS
$9.35B
| $1.01M | ﹤0.01% |
25,200
-60,200
| -70% | -$2.8M |
|
2912
PUT
KBR
KBR
$4.68B
| $1.01M | ﹤0.01% |
15,500
+13,700
| +761% | +$892K |
|
2913
PUT
PagerDuty
PD
$700M
| $1.01M | ﹤0.01% |
54,400
+19,500
| +56% | +$380K |
|
2914
Lowe's Companies
LOW
$116B
| $1.01M | ﹤0.01% |
+3,722
| New | +$901K |
|
2915
Moody's
MCO
$81.7B
| $1.01M | ﹤0.01% |
+2,121
| New | +$983K |
|
2916
Warby Parker
WRBY
$3.01B
| $1.01M | ﹤0.01% |
61,653
+27,261
| +79% | +$410K |
|
2917
CALL
Tandem Diabetes Care
TNDM
$1.17B
| $1M | ﹤0.01% |
23,700
-31,900
| -57% | -$1.35M |
|
2918
CALL
Blue Owl Capital
OBDC
$5.35B
| $1M | ﹤0.01% |
68,900
-10,500
| -13% | -$158K |
|
2919
CALL
Clearfield
CLFD
$421M
| $1M | ﹤0.01% |
25,700
-13,400
| -34% | -$521K |
|
2920
First Majestic Silver
AG
$8.05B
| $1M | ﹤0.01% |
166,674
-4,184
| -2% | -$24.3K |
|
2921
Applied Digital
APLD
$7.77B
| $1M | ﹤0.01% |
121,267
-59,018
| -33% | -$313K |
|
2922
CALL
National CineMedia
NCMI
$354M
| $1M | ﹤0.01% |
141,900
+12,400
| +10% | +$75.7K |
|
2923
PUT
SharkNinja
SN
$21B
| $1M | ﹤0.01% |
9,200
-7,000
| -43% | -$609K |
|
|
ARI
2924
CALL
Apollo Commercial Real Estate
ARI
$887M
| $998K | ﹤0.01% |
108,700
+67,900
| +166% | +$692K |
|
2925
CALL
QuidelOrtho
QDEL
$1.09B
| $998K | ﹤0.01% |
21,900
-12,600
| -37% | -$510K |
|
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.