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 |
Alibaba
BABA
|
+$50.3M |
| 2 |
Boeing
BA
|
+$24.3M |
| 3 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 4 |
Biogen
BIIB
|
+$15.9M |
| 5 |
FedEx
FDX
|
+$15.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class C
GOOG
|
+$60.3M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$36.4M |
| 3 |
Netflix
NFLX
|
+$19M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$17.3M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$14.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 0.49% |
| 2 | Technology | 0.48% |
| 3 | Healthcare | 0.35% |
| 4 | Industrials | 0.35% |
| 5 | Communication Services | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
SIEN
3676
DELISTED
Sientra, Inc.
SIEN
| $180K | ﹤0.01% |
2,792
+2,308
| +477% | +$147K |
|
|
MGLN
3677
DELISTED
Magellan Health Services, Inc.
MGLN
| $180K | ﹤0.01% |
2,904
-1,193
| -29% | -$79.5K |
|
3678
CALL
1-800-Flowers.com
FLWS
$254M
| $179K | ﹤0.01% |
121
-93
| -43% | -$1.61K |
|
3679
PUT
Natural Health Trends
NHTC
$15.6M
| $179K | ﹤0.01% |
253
-47
| -16% | -$345 |
|
3680
CALL
Varonis Systems
VRNS
$5.13B
| $179K | ﹤0.01% |
90
-606
| -87% | -$13.5K |
|
3681
CALL
ADMA Biologics
ADMA
$2.04B
| $178K | ﹤0.01% |
401
+267
| +199% | +$1.12K |
|
3682
CALL
Agios Pharmaceuticals
AGIO
$2.14B
| $178K | ﹤0.01% |
55
-77
| -58% | -$3.19K |
|
3683
CALL
Citizens
CIA
$257M
| $178K | ﹤0.01% |
260
+201
| +341% | +$1.41K |
|
3684
Inogen
INGN
$174M
| $178K | ﹤0.01% |
3,726
+2,508
| +206% | +$131K |
|
3685
PUT
Inseego
INSG
$111M
| $178K | ﹤0.01% |
37
+13
| +54% | +$605 |
|
3686
CALL
Prospect Capital
PSEC
$1.12B
| $178K | ﹤0.01% |
+271
| New | +$1.79K |
|
3687
Tronox
TROX
$981M
| $178K | ﹤0.01% |
21,521
+9,717
| +82% | +$93.6K |
|
3688
PUT
Unum
UNM
$14B
| $178K | ﹤0.01% |
60
+47
| +362% | +$1.4K |
|
|
ARD
3689
PUT
DELISTED
Ardagh Group S.A. Class A Common Shares
ARD
| $178K | ﹤0.01% |
+114
| New | +$1.96K |
|
|
VG
3690
CALL
DELISTED
Vonage Holdings Corporation
VG
| $178K | ﹤0.01% |
158
-40
| -20% | -$508 |
|
3691
CALL
Clean Harbors
CLH
$16B
| $177K | ﹤0.01% |
23
-16
| -41% | -$1.18K |
|
3692
CALL
Evolent Health
EVH
$421M
| $177K | ﹤0.01% |
247
+232
| +1,547% | +$1.67K |
|
3693
HP
HPQ
$25.9B
| $177K | ﹤0.01% |
9,356
+9,150
| +4,442% | +$180K |
|
3694
PUT
Insperity
NSP
$2.01B
| $177K | ﹤0.01% |
18
+15
| +500% | +$1.63K |
|
3695
Paysign
PAYS
$510M
| $177K | ﹤0.01% |
17,572
-57,961
| -77% | -$772K |
|
|
PINC
3696
CALL
DELISTED
Premier
PINC
| $176K | ﹤0.01% |
61
+46
| +307% | +$1.71K |
|
|
AD
3697
CALL
Array Digital Infrastructure
AD
$3.03B
| $176K | ﹤0.01% |
47
-139
| -75% | -$5.61K |
|
|
ICPT
3698
DELISTED
Intercept Pharmaceuticals, Inc.
ICPT
| $176K | ﹤0.01% |
+2,659
| New | +$179K |
|
3699
Archrock
AROC
$6.19B
| $175K | ﹤0.01% |
17,646
+14,124
| +401% | +$141K |
|
3700
CALL
Extra Space Storage
EXR
$32.2B
| $175K | ﹤0.01% |
15
+13
| +650% | +$1.5K |
|
Similar funds
Simplex Trading's Q3 2019 Portfolio in Review
As of Q3 2019, Simplex Trading held 8,410 positions worth $35.2B, down 4.1% from $36.6B the previous quarter. Its ten largest holdings account for 33% of the portfolio.
Simplex Trading's Q3 2019 filing shows 1,312 new, 3,129 increased, 2,596 reduced and 1,163 closed positions. Its largest new stake was SPDR Gold Trust: 131,281 shares worth $18.2M. The largest sale was Alphabet (Google) Class C, an estimated $60.3M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 0.49% of assets, up from 0.26% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q3 2019 buy was SPDR Gold Trust: 131,281 shares worth $18.2M.
- Simplex Trading added most to Alibaba in Q3 2019, an estimated $50.3M increase.
- Simplex Trading's biggest Q3 2019 reduction was Alphabet (Google) Class C, cutting an estimated $60.3M.
- Simplex Trading fully exited iShares Russell 2000 ETF in Q3 2019, selling an estimated $36.4M.
- Simplex Trading's ten largest holdings make up 33% of its $35.2B portfolio in Q3 2019.
- Simplex Trading opened 1,312 new positions and closed 1,163 in Q3 2019.
- Simplex Trading's portfolio value fell 4.1% quarter-over-quarter to $35.2B.
Based on Simplex Trading's 13F filing for Q3 2019, filed 15 Oct 2019.