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 |
iShares Russell 2000 ETF
IWM
|
+$67.5M |
| 2 |
Palantir
PLTR
|
+$64.7M |
| 3 |
PARA
Paramount Global Class B
PARA
|
+$31.5M |
| 4 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$30.7M |
| 5 |
Carnival Corporation Ltd
CCL
|
+$25.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$66M |
| 2 |
Tesla
TSLA
|
+$53.7M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$38.1M |
| 4 |
Invesco QQQ Trust
QQQ
|
+$37.6M |
| 5 |
AutoZone
AZO
|
+$28.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.65% |
| 2 | Consumer Discretionary | 0.49% |
| 3 | Healthcare | 0.32% |
| 4 | Financials | 0.3% |
| 5 | Industrials | 0.29% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
HUYA
2701
Huya Inc
HUYA
$558M
| $799K | ﹤0.01% |
41,047
+40,992
| +74,531% | +$1.03M |
|
2702
CALL
Lincoln Electric
LECO
$14.1B
| $799K | ﹤0.01% |
65
-20
| -24% | -$2.39K |
|
2703
PUT
Navient
NAVI
$809M
| $798K | ﹤0.01% |
558
+529
| +1,824% | +$6.51K |
|
|
IDEX
2704
CALL
DELISTED
Ideanomics, Inc. Common Stock
IDEX
| $798K | ﹤0.01% |
22
-2
| -8% | -$870 |
|
2705
PUT
Itron
ITRI
$3.76B
| $797K | ﹤0.01% |
90
+87
| +2,900% | +$8.6K |
|
2706
CALL
Lear
LEA
$7.26B
| $797K | ﹤0.01% |
44
-90
| -67% | -$15.2K |
|
2707
CALL
Vanguard Short-Term Treasury ETF
VGSH
$29.3B
| $797K | ﹤0.01% |
89
+87
| +4,350% | +$5.36K |
|
|
VER
2708
DELISTED
VEREIT, Inc.
VER
| $797K | ﹤0.01% |
+20,656
| New | +$773K |
|
2709
CALL
KKR & Co
KKR
$91.3B
| $796K | ﹤0.01% |
163
-289
| -64% | -$12.9K |
|
|
PLAN
2710
PUT
DELISTED
Anaplan, Inc.
PLAN
| $796K | ﹤0.01% |
148
-355
| -71% | -$23.9K |
|
2711
CALL
Ingles Markets
IMKTA
$1.67B
| $795K | ﹤0.01% |
129
+78
| +153% | +$4.08K |
|
2712
CALL
Momentus
MNTS
$90.2M
| – | – |
0
| – | – |
|
2713
CALL
Omeros
OMER
$821M
| $795K | ﹤0.01% |
447
-117
| -21% | -$2.27K |
|
2714
Texas Roadhouse
TXRH
$13.2B
| $795K | ﹤0.01% |
8,288
+6,415
| +342% | +$560K |
|
2715
CoreCivic
CXW
$3.09B
| $794K | ﹤0.01% |
87,815
-35,869
| -29% | -$276K |
|
|
THS
2716
CALL
DELISTED
Treehouse Foods
THS
| $794K | ﹤0.01% |
152
+32
| +27% | +$1.51K |
|
|
NS
2717
CALL
DELISTED
NuStar Energy L.P.
NS
| $794K | ﹤0.01% |
465
+190
| +69% | +$3.23K |
|
|
FCAC
2718
DELISTED
Falcon Capital Acquisition Corp. Class A Common Stock
FCAC
| $793K | ﹤0.01% |
+79,585
| New | +$867K |
|
2719
CALL
Assured Guaranty
AGO
$3.78B
| $790K | ﹤0.01% |
187
-121
| -39% | -$4.84K |
|
2720
WisdomTree Japan Hedged Equity Fund
DXJ
$7.23B
| $790K | ﹤0.01% |
12,894
+7,732
| +150% | +$451K |
|
2721
CALL
Pinnacle Financial Partners Inc
PNFP
$15.6B
| $789K | ﹤0.01% |
89
-40
| -31% | -$3.17K |
|
2722
PUT
Senseonics Holdings Inc
SENS
$262M
| $789K | ﹤0.01% |
149
+131
| +728% | +$7.42K |
|
2723
Zions Bancorporation
ZION
$10B
| $789K | ﹤0.01% |
+14,368
| New | +$740K |
|
2724
PUT
Ocugen
OCGN
$427M
| $788K | ﹤0.01% |
+1,162
| New | +$7.73K |
|
2725
Restaurant Brands International
QSR
$25.8B
| $788K | ﹤0.01% |
12,127
-14,239
| -54% | -$883K |
|
Similar funds
Simplex Trading's Q1 2021 Portfolio in Review
As of Q1 2021, Simplex Trading held 10,706 positions worth $55.7B, down 28% from $77.2B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading withdrew a net $23.5B in Q1 2021, closing 1,706 positions and reducing 3,151 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $38.1M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.65% of assets, up from 0.37% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in Pfizer worth $16.8M.
- Simplex Trading's largest Q1 2021 buy was Pfizer: 464,628 shares worth $16.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q1 2021, an estimated $67.5M increase.
- Simplex Trading's biggest Q1 2021 reduction was Amazon, cutting an estimated $66M.
- Simplex Trading fully exited Alphabet (Google) Class C in Q1 2021, selling an estimated $38.1M.
- Simplex Trading's ten largest holdings make up 43% of its $55.7B portfolio in Q1 2021.
- Simplex Trading opened 2,258 new positions and closed 1,706 in Q1 2021.
- Simplex Trading's portfolio value fell 28% quarter-over-quarter to $55.7B.
Based on Simplex Trading's 13F filing for Q1 2021, filed 26 Apr 2021.