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 |
Boeing
BA
|
+$55.8M |
| 2 |
Microsoft
MSFT
|
+$42.2M |
| 3 |
Pinduoduo
PDD
|
+$41.3M |
| 4 |
Apple
AAPL
|
+$32M |
| 5 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$28.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Broadcom
AVGO
|
+$95.2M |
| 2 |
Citigroup
C
|
+$57.2M |
| 3 |
Pfizer
PFE
|
+$56.4M |
| 4 |
TSMC
TSM
|
+$39.7M |
| 5 |
Starbucks
SBUX
|
+$35.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.4% |
| 2 | Consumer Discretionary | 0.29% |
| 3 | Healthcare | 0.15% |
| 4 | Industrials | 0.13% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4876
PUT
Neumora Therapeutics
NMRA
$306M
| $141K | ﹤0.01% |
10,700
+3,900
| +57% | +$45.5K |
|
4877
PUT
Performance Food Group
PFGC
$18B
| $141K | ﹤0.01% |
1,800
| – | – |
|
4878
PUT
Sportradar
SRAD
$4.35B
| $141K | ﹤0.01% |
11,700
+10,500
| +875% | +$120K |
|
|
TWO
4879
Two Harbors Investment
TWO
$1.27B
| $141K | ﹤0.01% |
10,173
-39,090
| -79% | -$533K |
|
|
VSTO
4880
PUT
DELISTED
Vista Outdoor Inc.
VSTO
| $141K | ﹤0.01% |
3,600
-3,600
| -50% | -$140K |
|
|
ELME
4881
PUT
Elme Communities
ELME
$144M
| $140K | ﹤0.01% |
8,000
-300
| -4% | -$5.1K |
|
4882
Essex Property Trust
ESS
$18.1B
| $140K | ﹤0.01% |
476
+45
| +10% | +$13.1K |
|
4883
PUT
Invesco Equal Weight 0-30 Year Treasury ETF
GOVI
$1.22B
| $140K | ﹤0.01% |
4,400
-1,400
| -24% | -$40.2K |
|
4884
PUT
Neonode
NEON
$13.4M
| $140K | ﹤0.01% |
15,400
+14,900
| +2,980% | +$75.6K |
|
4885
CALL
NatWest
NWG
$73.7B
| $140K | ﹤0.01% |
15,000
-12,500
| -45% | -$111K |
|
|
SF
4886
CALL
Stifel
SF
$12.5B
| $140K | ﹤0.01% |
2,250
-8,250
| -79% | -$471K |
|
4887
TriplePoint Venture Growth BDC
TPVG
$185M
| $140K | ﹤0.01% |
19,850
-4,119
| -17% | -$32.1K |
|
|
WW
4888
CALL
DELISTED
WW International
WW
| $140K | ﹤0.01% |
160,000
-189,200
| -54% | -$184K |
|
4889
Algonquin Power & Utilities
AQN
$4.6B
| $139K | ﹤0.01% |
+25,532
| New | +$145K |
|
4890
PUT
DXC Technology
DXC
$1.82B
| $139K | ﹤0.01% |
6,700
-3,600
| -35% | -$71.7K |
|
|
XRN
4891
PUT
Chiron Real Estate Inc
XRN
$516M
| $139K | ﹤0.01% |
2,820
+600
| +27% | +$28.3K |
|
4892
PUT
Kodiak Gas Services
KGS
$5.88B
| $139K | ﹤0.01% |
+4,800
| New | +$132K |
|
|
MREO
4893
Mereo BioPharma
MREO
$50.3M
| $139K | ﹤0.01% |
33,855
-7,538
| -18% | -$31.2K |
|
|
MRUS
4894
PUT
DELISTED
Merus
MRUS
| $139K | ﹤0.01% |
2,800
-700
| -20% | -$36.5K |
|
4895
CALL
Myriad Genetics
MYGN
$507M
| $139K | ﹤0.01% |
5,100
-700
| -12% | -$18.9K |
|
4896
PUT
Sensata Technologies
ST
$6.98B
| $139K | ﹤0.01% |
3,900
-19,600
| -83% | -$730K |
|
4897
CALL
Stem
STEM
$47.5M
| $139K | ﹤0.01% |
20,035
+14,855
| +287% | +$234K |
|
|
AAMI
4898
CALL
Acadian Asset Management
AAMI
$2.99B
| $139K | ﹤0.01% |
5,500
-9,900
| -64% | -$237K |
|
4899
Lightwave Logic
LWLG
$931M
| $138K | ﹤0.01% |
50,160
-1,780
| -3% | -$5.34K |
|
|
MREO
4900
PUT
Mereo BioPharma
MREO
$50.3M
| $138K | ﹤0.01% |
33,700
+7,400
| +28% | +$30.6K |
|
Similar funds
Simplex Trading's Q3 2024 Portfolio in Review
As of Q3 2024, Simplex Trading held 9,964 positions worth $170B, up 5.3% from $162B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q3 2024 filing shows 1,185 new, 3,232 increased, 3,829 reduced and 1,476 closed positions. Its largest new stake was Boeing: 325,328 shares worth $49.5M. The largest sale was Broadcom, an estimated $95.2M.
By sector, the portfolio is most concentrated in Technology at 0.4% of assets, down from 0.53% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2024 buy was Boeing: 325,328 shares worth $49.5M.
- Simplex Trading added most to Pinduoduo in Q3 2024, an estimated $41.3M increase.
- Simplex Trading's biggest Q3 2024 reduction was Citigroup, cutting an estimated $57.2M.
- Simplex Trading fully exited Broadcom in Q3 2024, selling an estimated $95.2M.
- Simplex Trading's ten largest holdings make up 50% of its $170B portfolio in Q3 2024.
- Simplex Trading opened 1,185 new positions and closed 1,476 in Q3 2024.
- Simplex Trading's portfolio value rose 5.3% quarter-over-quarter to $170B.
Based on Simplex Trading's 13F filing for Q3 2024, filed 8 Nov 2024.