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 | |
|---|---|---|---|---|---|---|
6376
PUT
Valvoline
VVV
$5.06B
| $37K | ﹤0.01% |
1,000
-700
| -41% | -$23.4K |
|
6377
State Street SPDR S&P Pharmaceuticals ETF
XPH
$481M
| $37K | ﹤0.01% |
+910
| New | +$34.5K |
|
6378
CALL
Zymeworks
ZYME
$1.62B
| $37K | ﹤0.01% |
3,600
+200
| +6% | +$1.59K |
|
|
SLCA
6379
PUT
DELISTED
U.S. SILICA HOLDINGS, INC.
SLCA
| $37K | ﹤0.01% |
3,300
-55,900
| -94% | -$662K |
|
|
LICY
6380
DELISTED
Li-Cycle Holdings Corp.
LICY
| $37K | ﹤0.01% |
+7,921
| New | +$89.9K |
|
6381
CALL
Aclaris Therapeutics
ACRS
$715M
| $36K | ﹤0.01% |
35,200
-19,500
| -36% | -$59.5K |
|
6382
PUT
Anterix
ATEX
$1.72B
| $36K | ﹤0.01% |
1,100
+1,000
| +1,000% | +$32.3K |
|
6383
PUT
CarGurus
CARG
$3.34B
| $36K | ﹤0.01% |
1,500
+300
| +25% | +$6.03K |
|
|
CGAU
6384
PUT
Centerra Gold
CGAU
$3.33B
| $36K | ﹤0.01% |
6,100
+4,000
| +190% | +$21.9K |
|
6385
CALL
Invesco CurrencyShares British Pound Sterling Trust
FXB
$77.1M
| $36K | ﹤0.01% |
+300
| New | +$35.8K |
|
6386
Green Dot
GDOT
$750M
| $36K | ﹤0.01% |
+3,722
| New | +$38.8K |
|
6387
i3 Verticals
IIIV
$419M
| $36K | ﹤0.01% |
1,746
+1,174
| +205% | +$23.6K |
|
6388
PUT
Immunic
IMUX
$178M
| $36K | ﹤0.01% |
2,450
+2,190
| +842% | +$26.8K |
|
|
INZY
6389
CALL
DELISTED
Inozyme Pharma
INZY
| $36K | ﹤0.01% |
8,600
+8,200
| +2,050% | +$29.1K |
|
|
IRS
6390
CALL
IRSA Inversiones y Representaciones
IRS
$1.31B
| $36K | ﹤0.01% |
4,351
+906
| +26% | +$6.44K |
|
6391
Lennox International
LII
$15B
| $36K | ﹤0.01% |
+81
| New | +$32.3K |
|
|
MVO
6392
PUT
DELISTED
MV Oil Trust
MVO
| $36K | ﹤0.01% |
3,000
-3,800
| -56% | -$46.3K |
|
6393
CALL
Myriad Genetics
MYGN
$476M
| $36K | ﹤0.01% |
1,900
-5,500
| -74% | -$95.1K |
|
6394
PUT
Neogen
NEOG
$2.05B
| $36K | ﹤0.01% |
1,800
+1,400
| +350% | +$23.7K |
|
6395
CALL
O-I Glass
OI
$1.18B
| $36K | ﹤0.01% |
2,200
-400
| -15% | -$6.17K |
|
|
PBT
6396
PUT
Permian Basin Royalty Trust
PBT
$1.36B
| $36K | ﹤0.01% |
2,600
-4,200
| -62% | -$75.2K |
|
6397
CALL
SiTime
SITM
$13.8B
| $36K | ﹤0.01% |
300
-600
| -67% | -$67.9K |
|
6398
CALL
Smith Micro Software
SMSI
$13.6M
| $36K | ﹤0.01% |
1,115
-278
| -20% | -$10.3K |
|
|
NSLR
6399
PUT
Neostellar Capital Corp
NSLR
$258M
| $36K | ﹤0.01% |
9,200
+5,300
| +136% | +$21.2K |
|
|
ONC
6400
CALL
BeOne Medicines Ltd
ONC
$33.9B
| $36K | ﹤0.01% |
200
-1,000
| -83% | -$181K |
|
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.