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 | |
|---|---|---|---|---|---|---|
6451
CALL
Columbus McKinnon
CMCO
$569M
| $40K | ﹤0.01% |
900
+800
| +800% | +$32.4K |
|
6452
CALL
CNA Financial
CNA
$14.3B
| $40K | ﹤0.01% |
900
+500
| +125% | +$22.1K |
|
|
CSGS
6453
DELISTED
CSG Systems International
CSGS
| $40K | ﹤0.01% |
790
+127
| +19% | +$6.6K |
|
|
DHC
6454
PUT
Diversified Healthcare Trust
DHC
$2.15B
| $40K | ﹤0.01% |
16,300
-402,800
| -96% | -$1.15M |
|
|
DRRX
6455
CALL
DELISTED
DURECT Corp
DRRX
| $40K | ﹤0.01% |
33,700
-151,100
| -82% | -$137K |
|
6456
PUT
Erie Indemnity
ERIE
$12.9B
| $40K | ﹤0.01% |
+100
| New | +$36.8K |
|
6457
PUT
Fortrea Holdings
FTRE
$1.79B
| $40K | ﹤0.01% |
1,000
-200
| -17% | -$6.93K |
|
6458
PUT
GATX Corp
GATX
$6.36B
| $40K | ﹤0.01% |
300
-200
| -40% | -$25.2K |
|
6459
CALL
Global Industrial
GIC
$1.36B
| $40K | ﹤0.01% |
+900
| New | +$38.4K |
|
|
XRN
6460
Chiron Real Estate Inc
XRN
$512M
| $40K | ﹤0.01% |
+937
| New | +$45K |
|
|
GOOD
6461
CALL
Gladstone Commercial Corp
GOOD
$603M
| $40K | ﹤0.01% |
2,900
-1,500
| -34% | -$19.5K |
|
6462
CALL
GeoPark
GPRK
$635M
| $40K | ﹤0.01% |
4,200
+4,000
| +2,000% | +$35.5K |
|
6463
IHS Holding
IHS
$2.77B
| $40K | ﹤0.01% |
11,338
+10,743
| +1,806% | +$36.7K |
|
6464
PUT
JELD-WEN Holding
JELD
$115M
| $40K | ﹤0.01% |
1,900
-1,300
| -41% | -$24.3K |
|
|
KALV
6465
DELISTED
KalVista Pharmaceuticals
KALV
| $40K | ﹤0.01% |
+3,426
| New | +$45.7K |
|
6466
MarketWise
MKTW
$53.1M
| $40K | ﹤0.01% |
1,174
+1,017
| +648% | +$43.1K |
|
|
NOTV
6467
PUT
DELISTED
Inotiv
NOTV
| $40K | ﹤0.01% |
3,700
-900
| -20% | -$5.38K |
|
6468
PUT
Olema Pharmaceuticals
OLMA
$1.02B
| $40K | ﹤0.01% |
3,600
-10,500
| -74% | -$135K |
|
6469
PUT
Par Pacific Holdings
PARR
$4.3B
| $40K | ﹤0.01% |
1,100
-2,500
| -69% | -$91.8K |
|
6470
CALL
PTC Therapeutics
PTCT
$5.88B
| $40K | ﹤0.01% |
1,400
-115,200
| -99% | -$3.23M |
|
6471
PUT
Stem
STEM
$49.2M
| $40K | ﹤0.01% |
925
+405
| +78% | +$22.5K |
|
6472
iShares Treasury Floating Rate Bond ETF
TFLO
$6.54B
| $40K | ﹤0.01% |
+800
| New | +$40.5K |
|
|
TSVT
6473
CALL
DELISTED
2seventy bio
TSVT
| $40K | ﹤0.01% |
7,600
-2,600
| -25% | -$12.2K |
|
6474
TTM Technologies
TTMI
$12.3B
| $40K | ﹤0.01% |
+2,574
| New | +$38.2K |
|
|
UHT
6475
PUT
Universal Health Realty Income Trust
UHT
$605M
| $40K | ﹤0.01% |
+1,100
| New | +$43.6K |
|
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.