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 | |
|---|---|---|---|---|---|---|
3701
CALL
Teekay Tankers
TNK
$2.69B
| $400K | ﹤0.01% |
288
-77
| -21% | -$979 |
|
3702
PUT
Marriott Vacations Worldwide
VAC
$3.49B
| $400K | ﹤0.01% |
23
+2
| +10% | +$312 |
|
3703
CALL
Arch Capital
ACGL
$36.8B
| $399K | ﹤0.01% |
104
-317
| -75% | -$11.3K |
|
3704
Sysco
SYY
$40.9B
| $399K | ﹤0.01% |
5,077
-17,775
| -78% | -$1.38M |
|
3705
Xylem
XYL
$28.8B
| $399K | ﹤0.01% |
+3,798
| New | +$385K |
|
|
AY
3706
PUT
DELISTED
Atlantica Sustainable Infrastructure plc Ordinary Shares
AY
| $399K | ﹤0.01% |
109
-58
| -35% | -$2.28K |
|
3707
B2Gold
BTG
$4.94B
| $398K | ﹤0.01% |
92,447
+8,894
| +11% | +$43.4K |
|
|
AGNT
3708
AGNT Inc
AGNT
$641M
| $398K | ﹤0.01% |
+8,750
| New | +$466K |
|
3709
PUT
Blue Owl Capital
OWL
$6.45B
| $398K | ﹤0.01% |
+403
| New | +$4.17K |
|
|
SCS
3710
CALL
DELISTED
Steelcase
SCS
| $398K | ﹤0.01% |
277
+194
| +234% | +$2.75K |
|
|
QIWI
3711
PUT
DELISTED
QIWI PLC
QIWI
| $398K | ﹤0.01% |
374
-1,848
| -83% | -$19.8K |
|
3712
PUT
NewtekOne
NEWT
$428M
| $397K | ﹤0.01% |
149
+90
| +153% | +$2.06K |
|
3713
Pegasystems
PEGA
$5.04B
| $397K | ﹤0.01% |
6,954
+4,006
| +136% | +$262K |
|
3714
PUT
Republic Services
RSG
$68.3B
| $397K | ﹤0.01% |
40
-36
| -47% | -$3.38K |
|
|
LOV
3715
PUT
DELISTED
Spark Networks SE American Depositary Shares
LOV
| $397K | ﹤0.01% |
+533
| New | +$3.21K |
|
|
OPTU
3716
Optimum Communications Inc
OPTU
$294M
| $395K | ﹤0.01% |
12,150
-9,432
| -44% | -$329K |
|
3717
CALL
Banco Bilbao Vizcaya Argentaria
BBVA
$143B
| $395K | ﹤0.01% |
758
-1,240
| -62% | -$6.54K |
|
3718
Bloomin' Brands
BLMN
$746M
| $395K | ﹤0.01% |
14,606
+14,546
| +24,243% | +$352K |
|
3719
CALL
Cardiff Oncology
CRDF
$61.3M
| $395K | ﹤0.01% |
427
-289
| -40% | -$3.51K |
|
3720
CRH
CRH
$67.1B
| $395K | ﹤0.01% |
8,417
+5,695
| +209% | +$256K |
|
3721
CALL
Donaldson
DCI
$10.8B
| $395K | ﹤0.01% |
68
+9
| +15% | +$538 |
|
3722
PUT
Gentex
GNTX
$5.17B
| $395K | ﹤0.01% |
111
+72
| +185% | +$2.56K |
|
3723
PUT
AeroVironment
AVAV
$7.38B
| $394K | ﹤0.01% |
34
-33
| -49% | -$3.86K |
|
3724
CALL
Essential Properties Realty Trust
EPRT
$6.95B
| $394K | ﹤0.01% |
173
+41
| +31% | +$918 |
|
3725
Immersion
IMMR
$247M
| $394K | ﹤0.01% |
41,231
+3,633
| +10% | +$43.2K |
|
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.