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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
7001
Kaixin Holdings
KXIN
$8.93M
| $18K | ﹤0.01% |
+1
| New | +$40.8K |
|
7002
PUT
Mizuho Financial
MFG
$129B
| $18K | ﹤0.01% |
+5,300
| New | +$18K |
|
7003
PUT
MarketWise
MKTW
$54.4M
| $18K | ﹤0.01% |
330
+260
| +371% | +$12.7K |
|
|
NOA
7004
PUT
North American Construction
NOA
$376M
| $18K | ﹤0.01% |
900
| – | – |
|
7005
CALL
Energy Vault
NRGV
$531M
| $18K | ﹤0.01% |
8,100
-3,000
| -27% | -$6.92K |
|
|
OLP
7006
One Liberty Properties
OLP
$551M
| $18K | ﹤0.01% |
826
-3
| -0.4% | -$60 |
|
7007
Quanterix
QTRX
$173M
| $18K | ﹤0.01% |
681
-5,182
| -88% | -$122K |
|
7008
Dr. Reddy's Laboratories
RDY
$9.8B
| $18K | ﹤0.01% |
1,340
-350
| -21% | -$4.68K |
|
7009
PUT
Rigetti Computing
RGTI
$5.2B
| $18K | ﹤0.01% |
18,600
-34,000
| -65% | -$38.8K |
|
|
RPTX
7010
PUT
DELISTED
Repare Therapeutics
RPTX
| $18K | ﹤0.01% |
+2,600
| New | +$14.5K |
|
7011
CALL
Stepan Co
SCL
$1.31B
| $18K | ﹤0.01% |
+200
| New | +$16K |
|
|
SHOE
7012
CALL
Shoe Station Group
SHOE
$410M
| $18K | ﹤0.01% |
600
-6,500
| -92% | -$164K |
|
|
SEM
7013
CALL
DELISTED
Select Medical
SEM
| $18K | ﹤0.01% |
1,485
-742
| -33% | -$9.36K |
|
7014
Sight Sciences
SGHT
$279M
| $18K | ﹤0.01% |
+3,636
| New | +$11.2K |
|
7015
CALL
SOPHiA GENETICS
SOPH
$474M
| $18K | ﹤0.01% |
+4,000
| New | +$15K |
|
7016
CALL
Spire
SR
$4.87B
| $18K | ﹤0.01% |
+300
| New | +$17.9K |
|
|
TGI
7017
CALL
DELISTED
Triumph Group
TGI
| $18K | ﹤0.01% |
1,100
-4,200
| -79% | -$42.6K |
|
7018
CALL
Toro Corp
TORO
$174M
| $18K | ﹤0.01% |
+3,700
| New | +$16.7K |
|
7019
Townsquare Media
TSQ
$106M
| $18K | ﹤0.01% |
+1,768
| New | +$16.7K |
|
|
TUYA
7020
PUT
Tuya Inc
TUYA
$1.01B
| $18K | ﹤0.01% |
+7,900
| New | +$14.6K |
|
7021
PUT
Televisa
TV
$1.48B
| $18K | ﹤0.01% |
+5,400
| New | +$15.3K |
|
7022
Travelzoo
TZOO
$105M
| $18K | ﹤0.01% |
1,958
+1,064
| +119% | +$8.49K |
|
7023
PUT
Veritone
VERI
$100M
| $18K | ﹤0.01% |
10,400
+9,300
| +845% | +$20.7K |
|
7024
Vir Biotechnology
VIR
$1.48B
| $18K | ﹤0.01% |
+1,794
| New | +$16.4K |
|
7025
Vanguard Tax-Exempt Bond Index Fund
VTEB
$45.2B
| $18K | ﹤0.01% |
355
-628
| -64% | -$30.8K |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.