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 | |
|---|---|---|---|---|---|---|
3526
Oscar Health
OSCR
$8.54B
| $585K | ﹤0.01% |
+63,991
| New | +$442K |
|
3527
Tandem Diabetes Care
TNDM
$1.18B
| $585K | ﹤0.01% |
+19,801
| New | +$411K |
|
3528
PUT
Vestis
VSTS
$2.03B
| $585K | ﹤0.01% |
+27,700
| New | +$475K |
|
3529
CALL
Spire Global
SPIR
$432M
| $583K | ﹤0.01% |
74,600
-38,200
| -34% | -$195K |
|
3530
CALL
Ero Copper
ERO
$2.73B
| $582K | ﹤0.01% |
+36,900
| New | +$519K |
|
|
GDEN
3531
PUT
DELISTED
Golden Entertainment
GDEN
| $582K | ﹤0.01% |
+14,600
| New | +$529K |
|
3532
PUT
Arrowhead Research
ARWR
$12B
| $581K | ﹤0.01% |
19,000
+13,000
| +217% | +$345K |
|
3533
CALL
Ispire Technology
ISPR
$93M
| $581K | ﹤0.01% |
+47,900
| New | +$490K |
|
3534
CALL
BioCryst Pharmaceuticals
BCRX
$2.43B
| $579K | ﹤0.01% |
96,700
-21,300
| -18% | -$123K |
|
3535
PUT
W.R. Berkley
WRB
$28.1B
| $579K | ﹤0.01% |
12,300
+5,850
| +91% | +$267K |
|
3536
DHT Holdings
DHT
$2.95B
| $578K | ﹤0.01% |
+58,940
| New | +$606K |
|
3537
Public Service Enterprise Group
PEG
$39.5B
| $578K | ﹤0.01% |
+9,465
| New | +$582K |
|
3538
Papa John's
PZZA
$997M
| $578K | ﹤0.01% |
7,592
-12,155
| -62% | -$827K |
|
3539
PUT
Xometry
XMTR
$4.75B
| $578K | ﹤0.01% |
16,100
+11,600
| +258% | +$249K |
|
|
SAFE
3540
Safehold
SAFE
$1.19B
| $575K | ﹤0.01% |
24,600
+8,827
| +56% | +$166K |
|
3541
PUT
Tecnoglass
TGLS
$2.01B
| $575K | ﹤0.01% |
12,600
+7,300
| +138% | +$264K |
|
3542
CALL
Copa Holdings
CPA
$5.65B
| $574K | ﹤0.01% |
5,400
+1,200
| +29% | +$110K |
|
3543
CALL
Cirrus Logic
CRUS
$6.87B
| $574K | ﹤0.01% |
6,900
-3,700
| -35% | -$277K |
|
3544
CALL
Evolent Health
EVH
$429M
| $574K | ﹤0.01% |
17,400
+8,400
| +93% | +$238K |
|
3545
State Street SPDR Portfolio Long Term Treasury ETF
SPTL
$10.6B
| $574K | ﹤0.01% |
19,782
+3,046
| +18% | +$81.1K |
|
3546
CALL
SS&C Technologies
SSNC
$18.1B
| $574K | ﹤0.01% |
9,400
+7,700
| +453% | +$421K |
|
|
MDC
3547
CALL
DELISTED
M.D.C. Holdings, Inc.
MDC
| $574K | ﹤0.01% |
10,400
+2,600
| +33% | +$115K |
|
3548
PUT
Ternium
TX
$9.37B
| $573K | ﹤0.01% |
13,500
-39,900
| -75% | -$1.54M |
|
|
BASE
3549
PUT
DELISTED
Couchbase
BASE
| $572K | ﹤0.01% |
25,400
+22,800
| +877% | +$418K |
|
3550
CALL
Limbach Holdings
LMB
$886M
| $572K | ﹤0.01% |
12,600
+7,600
| +152% | +$273K |
|
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.