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 | |
|---|---|---|---|---|---|---|
7001
KraneShares MSCI China Clean Technology Index ETF
KGRN
$54.9M
| $13K | ﹤0.01% |
543
+24
| +5% | +$478 |
|
7002
Kennametal
KMT
$2.58B
| $13K | ﹤0.01% |
+533
| New | +$13.3K |
|
7003
Kodiak Sciences
KOD
$2.45B
| $13K | ﹤0.01% |
4,998
-311
| -6% | -$827 |
|
7004
CALL
Lesaka Technologies
LSAK
$380M
| $13K | ﹤0.01% |
2,600
| – | – |
|
7005
Lloyds Banking Group
LYG
$85.6B
| $13K | ﹤0.01% |
4,434
-2,135
| -33% | -$6.41K |
|
7006
iShares MSCI USA Momentum Factor ETF
MTUM
$23.9B
| $13K | ﹤0.01% |
+68
| New | +$13.2K |
|
7007
MaxCyte
MXCT
$110M
| $13K | ﹤0.01% |
3,499
+1,873
| +115% | +$7.89K |
|
7008
Nerdy
NRDY
$108M
| $13K | ﹤0.01% |
14,182
-527
| -4% | -$675 |
|
7009
Insperity
NSP
$2.11B
| $13K | ﹤0.01% |
152
-315
| -67% | -$29.2K |
|
|
NXDT
7010
NexPoint Diversified Real Estate Trust
NXDT
$263M
| $13K | ﹤0.01% |
2,129
-18
| -0.8% | -$107 |
|
7011
CALL
OraSure Technologies
OSUR
$271M
| $13K | ﹤0.01% |
3,200
+2,900
| +967% | +$12.5K |
|
7012
PUT
POSCO
PKX
$14.9B
| $13K | ﹤0.01% |
200
| – | – |
|
7013
CALL
Douglas Dynamics
PLOW
$995M
| $13K | ﹤0.01% |
+500
| New | +$13.2K |
|
|
PNNT
7014
PUT
Pennant Park Investment Corp
PNNT
$223M
| $13K | ﹤0.01% |
2,000
+1,300
| +186% | +$9.27K |
|
7015
Prudential
PUK
$36.5B
| $13K | ﹤0.01% |
741
-2,558
| -78% | -$44.7K |
|
7016
PUT
Redwire
RDW
$1.91B
| $13K | ﹤0.01% |
1,900
-12,900
| -87% | -$85.2K |
|
7017
CALL
Research Frontiers
REFR
$16M
| $13K | ﹤0.01% |
6,000
+1,400
| +30% | +$2.9K |
|
7018
Regenxbio
RGNX
$617M
| $13K | ﹤0.01% |
1,287
-3,968
| -76% | -$48.4K |
|
|
RGLS
7019
CALL
DELISTED
Regulus Therapeutics
RGLS
| $13K | ﹤0.01% |
8,900
-2,400
| -21% | -$3.97K |
|
7020
PUT
Rigetti Computing
RGTI
$4.52B
| $13K | ﹤0.01% |
16,800
+5,500
| +49% | +$5.02K |
|
|
RYZ
7021
PUT
Ryerson Holding Corp
RYZ
$1.51B
| $13K | ﹤0.01% |
700
-200
| -22% | -$4.04K |
|
7022
PUT
Saic
SAIC
$4.95B
| $13K | ﹤0.01% |
100
-500
| -83% | -$63.1K |
|
7023
PUT
Tanger
SKT
$4.81B
| $13K | ﹤0.01% |
400
-4,500
| -92% | -$131K |
|
7024
State Street SPDR Portfolio S&P 600 Small Cap ETF
SPSM
$17B
| $13K | ﹤0.01% |
291
+125
| +75% | +$5.49K |
|
7025
CALL
SurgePays
SURG
$5.67M
| $13K | ﹤0.01% |
7,400
-57,500
| -89% | -$130K |
|
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.