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 |
Pfizer
PFE
|
+$89.5M |
| 2 |
State Street Energy Select Sector SPDR ETF
XLE
|
+$85.5M |
| 3 |
Boeing
BA
|
+$71M |
| 4 |
Intel
INTC
|
+$60.7M |
| 5 |
Meta Platforms (Facebook)
META
|
+$48.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$117M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$104M |
| 3 |
Alibaba
BABA
|
+$82.8M |
| 4 |
Walt Disney
DIS
|
+$68.5M |
| 5 |
Citigroup
C
|
+$59.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.38% |
| 2 | Healthcare | 0.27% |
| 3 | Consumer Discretionary | 0.25% |
| 4 | Industrials | 0.17% |
| 5 | Communication Services | 0.16% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3451
The GEO Group
GEO
$4.11B
| $732K | ﹤0.01% |
+51,891
| New | +$618K |
|
3452
CALL
Ardmore Shipping
ASC
$669M
| $730K | ﹤0.01% |
44,500
+5,100
| +13% | +$81.2K |
|
3453
CALL
Itron
ITRI
$4.75B
| $730K | ﹤0.01% |
7,900
+7,400
| +1,480% | +$596K |
|
3454
Hippo Holdings
HIPO
$789M
| $728K | ﹤0.01% |
39,896
+39,881
| +265,873% | +$491K |
|
|
BORR
3455
PUT
Borr Drilling
BORR
$1.2B
| $727K | ﹤0.01% |
106,200
-66,300
| -38% | -$435K |
|
3456
PUT
RPC Inc
RES
$1.14B
| $727K | ﹤0.01% |
94,000
+65,900
| +235% | +$476K |
|
3457
PUT
Donnelley Financial Solutions
DFIN
$1.31B
| $725K | ﹤0.01% |
+11,700
| New | +$732K |
|
3458
American Superconductor
AMSC
$1.39B
| $724K | ﹤0.01% |
+53,662
| New | +$666K |
|
3459
CALL
FS KKR Capital
FSK
$3.08B
| $724K | ﹤0.01% |
38,000
-29,800
| -44% | -$590K |
|
3460
IES Holdings
IESC
$10.8B
| $724K | ﹤0.01% |
+5,960
| New | +$571K |
|
3461
Campbell Soup
CPB
$6.8B
| $723K | ﹤0.01% |
+16,272
| New | +$704K |
|
3462
CALL
Rush Street Interactive
RSI
$3.16B
| $723K | ﹤0.01% |
111,200
+42,600
| +62% | +$229K |
|
3463
PUT
TeraWulf
WULF
$8.47B
| $722K | ﹤0.01% |
274,800
+203,700
| +286% | +$402K |
|
3464
ZIM Integrated Shipping Services
ZIM
$2.9B
| $722K | ﹤0.01% |
71,391
-18,256
| -20% | -$222K |
|
3465
CALL
Lumen
LUMN
$6.38B
| $718K | ﹤0.01% |
460,500
+179,600
| +64% | +$281K |
|
|
SP
3466
DELISTED
SP Plus Corporation
SP
| $718K | ﹤0.01% |
13,752
-3,400
| -20% | -$175K |
|
3467
CALL
B&G Foods
BGS
$297M
| $717K | ﹤0.01% |
62,700
-32,600
| -34% | -$341K |
|
3468
CALL
Western Union
WU
$2.58B
| $717K | ﹤0.01% |
51,300
-26,600
| -34% | -$343K |
|
|
SHCO
3469
DELISTED
Soho House & Co
SHCO
| $716K | ﹤0.01% |
126,329
+86,164
| +215% | +$521K |
|
3470
CALL
United Parks & Resorts
PRKS
$2.21B
| $713K | ﹤0.01% |
12,700
-57,800
| -82% | -$2.93M |
|
3471
CALL
Fidelity Enhanced Large Cap Core ETF
FELC
$7.9B
| $712K | ﹤0.01% |
21,300
+2,800
| +15% | +$78.4K |
|
3472
Oscar Health
OSCR
$9.47B
| $712K | ﹤0.01% |
47,913
-16,078
| -25% | -$220K |
|
3473
CALL
Workiva
WK
$3.28B
| $712K | ﹤0.01% |
8,400
-6,900
| -45% | -$621K |
|
3474
AerCap
AER
$24.3B
| $711K | ﹤0.01% |
8,188
-50,000
| -86% | -$3.93M |
|
3475
PUT
Broadstone Net Lease
BNL
$4.3B
| $711K | ﹤0.01% |
45,400
+41,300
| +1,007% | +$651K |
|
Similar funds
Simplex Trading's Q1 2024 Portfolio in Review
As of Q1 2024, Simplex Trading held 10,366 positions worth $173B, up 11% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading's Q1 2024 filing shows 1,549 new, 3,675 increased, 3,484 reduced and 1,506 closed positions. Its largest new stake was Boeing: 345,653 shares worth $66.7M. The largest sale was NVIDIA, an estimated $117M.
By sector, the portfolio is most concentrated in Technology at 0.38% of assets, up from 0.33% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q1 2024 buy was Boeing: 345,653 shares worth $66.7M.
- Simplex Trading added most to Pfizer in Q1 2024, an estimated $89.5M increase.
- Simplex Trading's biggest Q1 2024 reduction was NVIDIA, cutting an estimated $117M.
- Simplex Trading fully exited Citigroup in Q1 2024, selling an estimated $59.8M.
- Simplex Trading's ten largest holdings make up 47% of its $173B portfolio in Q1 2024.
- Simplex Trading opened 1,549 new positions and closed 1,506 in Q1 2024.
- Simplex Trading's portfolio value rose 11% quarter-over-quarter to $173B.
Based on Simplex Trading's 13F filing for Q1 2024, filed 25 Apr 2024.