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 |
AMC Entertainment Holdings
AMC
|
+$39.3M |
| 2 |
AT&T
T
|
+$29.8M |
| 3 |
NVIDIA
NVDA
|
+$28.3M |
| 4 |
Micron Technology
MU
|
+$22.9M |
| 5 |
Baidu
BIDU
|
+$22.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$36.1M |
| 2 |
Tesla
TSLA
|
+$35.2M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$25.9M |
| 4 |
Palantir
PLTR
|
+$25.7M |
| 5 |
Wells Fargo
WFC
|
+$20.4M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.47% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.26% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
TCS
4401
DELISTED
THE CONTAINER STORE GROUP, INC.
TCS
| $428K | ﹤0.01% |
2,191
-2,075
| -49% | -$431K |
|
|
CSLT
4402
CALL
DELISTED
CASTLIGHT HEALTH, INC.
CSLT
| $428K | ﹤0.01% |
163,000
+162,779
| +73,656% | +$303K |
|
4403
CALL
MiMedx Group
MDXG
$629M
| $427K | ﹤0.01% |
34,200
+34,145
| +62,082% | +$370K |
|
4404
Utz Brands
UTZ
$1.25B
| $427K | ﹤0.01% |
19,635
-3,483
| -15% | -$87K |
|
|
VG
4405
DELISTED
Vonage Holdings Corporation
VG
| $427K | ﹤0.01% |
29,656
+992
| +3% | +$13.6K |
|
4406
CALL
Atkore
ATKR
$2.41B
| $426K | ﹤0.01% |
6,000
+5,948
| +11,438% | +$453K |
|
4407
Cohu
COHU
$1.86B
| $426K | ﹤0.01% |
11,606
+2,451
| +27% | +$97.2K |
|
4408
CALL
Varonis Systems
VRNS
$4.66B
| $426K | ﹤0.01% |
7,400
+7,295
| +6,948% | +$380K |
|
4409
PUT
BBVA Argentina
BBAR
$3.85B
| $425K | ﹤0.01% |
130,800
+130,571
| +57,018% | +$407K |
|
4410
CALL
Navient
NAVI
$819M
| $425K | ﹤0.01% |
22,000
+21,312
| +3,098% | +$366K |
|
4411
PUT
SouthState Bank Corp
SSB
$10.2B
| $425K | ﹤0.01% |
5,200
+5,158
| +12,281% | +$439K |
|
4412
PUT
MacroGenics
MGNX
$233M
| $424K | ﹤0.01% |
15,800
+15,582
| +7,148% | +$456K |
|
4413
iShares MSCI USA Momentum Factor ETF
MTUM
$23.6B
| $424K | ﹤0.01% |
2,449
-8,679
| -78% | -$1.47M |
|
4414
CALL
MaxLinear
MXL
$5.19B
| $424K | ﹤0.01% |
10,000
+9,770
| +4,248% | +$364K |
|
4415
PUT
Omnicell
OMCL
$1.88B
| $424K | ﹤0.01% |
2,800
+2,772
| +9,900% | +$386K |
|
|
ENLC
4416
CALL
DELISTED
ENLINK MIDSTREAM, LLC
ENLC
| $423K | ﹤0.01% |
+66,200
| New | +$339K |
|
4417
CALL
HUB Group
HUBG
$2.92B
| $422K | ﹤0.01% |
12,800
+12,700
| +12,700% | +$432K |
|
4418
CALL
PLAYSTUDIOS Inc
MYPS
$76.8M
| $422K | ﹤0.01% |
+56,900
| New | +$550K |
|
4419
CALL
National Health Investors
NHI
$3.79B
| $422K | ﹤0.01% |
6,300
+6,206
| +6,602% | +$433K |
|
4420
PUT
Taboola.com
TBLA
$1.41B
| $422K | ﹤0.01% |
+40,800
| New | +$422K |
|
4421
CALL
IMAX
IMAX
$2.67B
| $421K | ﹤0.01% |
19,600
+19,312
| +6,706% | +$416K |
|
4422
CALL
Valaris Ltd Warrants
VAL.WS
$590M
| $421K | ﹤0.01% |
+30,200
| New | +$65.4K |
|
4423
Vanguard High Dividend Yield ETF
VYM
$80.8B
| $421K | ﹤0.01% |
4,019
-3,696
| -48% | -$388K |
|
|
GPP
4424
DELISTED
Green Plains Partners LP
GPP
| $421K | ﹤0.01% |
32,903
-17,448
| -35% | -$213K |
|
4425
PUT
Banc of California
BANC
$2.87B
| $420K | ﹤0.01% |
24,000
+23,644
| +6,642% | +$422K |
|
Similar funds
Simplex Trading's Q2 2021 Portfolio in Review
As of Q2 2021, Simplex Trading held 11,184 positions worth $104B, up 86% from $55.7B the previous quarter. Its ten largest holdings account for 40% of the portfolio.
Simplex Trading deployed $97.5B of net new capital in Q2 2021, opening 2,250 new positions and adding to 6,673 existing holdings. Its largest new stake was AT&T: 1,311,180 shares worth $28.5M.
By sector, the portfolio is most concentrated in Technology at 0.47% of assets, down from 0.65% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, an estimated $25.9M trimmed.
- Simplex Trading's largest Q2 2021 buy was AT&T: 1,311,180 shares worth $28.5M.
- Simplex Trading added most to AMC Entertainment Holdings in Q2 2021, an estimated $39.3M increase.
- Simplex Trading's biggest Q2 2021 reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, cutting an estimated $25.9M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2021, selling an estimated $36.1M.
- Simplex Trading's ten largest holdings make up 40% of its $104B portfolio in Q2 2021.
- Simplex Trading opened 2,250 new positions and closed 1,197 in Q2 2021.
- Simplex Trading's portfolio value rose 86% quarter-over-quarter to $104B.
Based on Simplex Trading's 13F filing for Q2 2021, filed 12 Aug 2021.