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 | |
|---|---|---|---|---|---|---|
|
AEVA
5451
PUT
Aeva Technologies
AEVA
$1.2B
| $93K | ﹤0.01% |
24,580
+1,020
| +4% | +$3.26K |
|
5452
PUT
Amkor Technology
AMKR
$12.4B
| $93K | ﹤0.01% |
2,800
-7,300
| -72% | -$192K |
|
5453
CALL
Beam Global
BEEM
$23.3M
| $93K | ﹤0.01% |
13,200
+11,200
| +560% | +$70.2K |
|
|
CSW
5454
CSW Industrials
CSW
$5.2B
| $93K | ﹤0.01% |
+450
| New | +$81.6K |
|
5455
CALL
Clearway Energy Class C
CWEN
$4.94B
| $93K | ﹤0.01% |
3,400
-3,900
| -53% | -$91K |
|
5456
PUT
GFL Environmental
GFL
$14.9B
| $93K | ﹤0.01% |
2,700
-100
| -4% | -$3.04K |
|
5457
CALL
Horizon Technology Finance
HRZN
$295M
| $93K | ﹤0.01% |
7,100
+2,300
| +48% | +$28.1K |
|
5458
CALL
ICF International
ICFI
$1.46B
| $93K | ﹤0.01% |
700
+600
| +600% | +$78.8K |
|
5459
Newmark Group
NMRK
$2.66B
| $93K | ﹤0.01% |
+8,525
| New | +$64.4K |
|
5460
Vanguard Materials ETF
VAW
$2.95B
| $93K | ﹤0.01% |
+494
| New | +$86.7K |
|
|
VERV
5461
CALL
DELISTED
Verve Therapeutics
VERV
| $93K | ﹤0.01% |
6,700
+4,200
| +168% | +$52.1K |
|
5462
PUT
Valmont Industries
VMI
$9.3B
| $93K | ﹤0.01% |
+400
| New | +$87.9K |
|
|
SRTA
5463
CALL
Strata Critical Medical Inc
SRTA
$434M
| $92K | ﹤0.01% |
26,100
+2,700
| +12% | +$7.75K |
|
5464
Clarivate
CLVT
$1.27B
| $92K | ﹤0.01% |
+9,999
| New | +$73.9K |
|
5465
CALL
DLH Holdings
DLHC
$70.7M
| $92K | ﹤0.01% |
+5,900
| New | +$82.9K |
|
|
EXK
5466
CALL
Endeavour Silver
EXK
$2.23B
| $92K | ﹤0.01% |
46,800
-42,400
| -48% | -$92.2K |
|
5467
PUT
GeoPark
GPRK
$633M
| $92K | ﹤0.01% |
10,800
+10,400
| +2,600% | +$98.3K |
|
5468
RBB Bancorp
RBB
$448M
| $92K | ﹤0.01% |
4,859
-4,076
| -46% | -$60.8K |
|
5469
Redwire
RDW
$2.06B
| $92K | ﹤0.01% |
32,313
-20,529
| -39% | -$56.1K |
|
5470
CALL
Thomson Reuters
TRI
$42.8B
| $92K | ﹤0.01% |
985
+690
| +234% | +$93.2K |
|
5471
Upbound Group
UPBD
$1.13B
| $92K | ﹤0.01% |
+2,716
| New | +$80.9K |
|
|
VZIO
5472
CALL
DELISTED
VIZIO Holding Corp.
VZIO
| $92K | ﹤0.01% |
12,000
-53,900
| -82% | -$337K |
|
5473
Allot
ALLT
$372M
| $91K | ﹤0.01% |
55,581
-76,136
| -58% | -$127K |
|
5474
CALL
Blue Bird Corp
BLBD
$2.35B
| $91K | ﹤0.01% |
3,400
+1,800
| +113% | +$37.1K |
|
|
FPI
5475
CALL
Farmland Partners
FPI
$408M
| $91K | ﹤0.01% |
7,300
+600
| +9% | +$6.95K |
|
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.