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 | |
|---|---|---|---|---|---|---|
3851
PUT
Karyopharm Therapeutics
KPTI
$155M
| $153K | ﹤0.01% |
11
-12
| -52% | -$1.63K |
|
3852
CALL
NewtekOne
NEWT
$426M
| $153K | ﹤0.01% |
68
+57
| +518% | +$1.26K |
|
3853
Outfront Media
OUT
$5.75B
| $153K | ﹤0.01% |
5,602
-36,710
| -87% | -$979K |
|
3854
CALL
Power Integrations
POWI
$3.15B
| $153K | ﹤0.01% |
34
-2
| -6% | -$87 |
|
|
TPC
3855
Tutor Perini Cor
TPC
$4.03B
| $153K | ﹤0.01% |
10,736
-1,650
| -13% | -$20.1K |
|
|
MDP
3856
CALL
DELISTED
Meredith Corporation
MDP
| $153K | ﹤0.01% |
+42
| New | +$1.95K |
|
3857
CALL
Extreme Networks
EXTR
$3.8B
| $152K | ﹤0.01% |
209
+73
| +54% | +$528 |
|
|
INFN
3858
CALL
DELISTED
Infinera Corporation Common Stock
INFN
| $152K | ﹤0.01% |
280
-102
| -27% | -$448 |
|
3859
Aegon
AEG
$13.3B
| $151K | ﹤0.01% |
39,811
+10,238
| +35% | +$40.8K |
|
|
OSG
3860
Octave Specialty Group
OSG
$257M
| $151K | ﹤0.01% |
7,732
-14,639
| -65% | -$269K |
|
3861
PUT
CarGurus
CARG
$3.34B
| $151K | ﹤0.01% |
49
-56
| -53% | -$1.91K |
|
3862
Teucrium Corn Fund
CORN
$178M
| $151K | ﹤0.01% |
9,588
+6,623
| +223% | +$103K |
|
3863
CALL
Greenlight Captial
GLRE
$579M
| $151K | ﹤0.01% |
144
-455
| -76% | -$4.29K |
|
3864
PUT
Oshkosh
OSK
$8.91B
| $151K | ﹤0.01% |
20
-6
| -23% | -$459 |
|
3865
PUT
Worthington Enterprises
WOR
$2.74B
| $151K | ﹤0.01% |
68
+44
| +183% | +$1.02K |
|
3866
CALL
W.R. Berkley
WRB
$28.1B
| $151K | ﹤0.01% |
47
+11
| +31% | +$344 |
|
3867
ManpowerGroup
MAN
$2.6B
| $150K | ﹤0.01% |
1,784
+554
| +45% | +$48.3K |
|
3868
CALL
Invesco Aerospace & Defense ETF
PPA
$8.07B
| $150K | ﹤0.01% |
29
+14
| +93% | +$933 |
|
3869
CALL
Perdoceo Education
PRDO
$2.17B
| $150K | ﹤0.01% |
95
+83
| +692% | +$1.63K |
|
3870
Schwab US Broad Market ETF
SCHB
$42.3B
| $150K | ﹤0.01% |
12,750
+1,284
| +11% | +$15.2K |
|
3871
PUT
Yext
YEXT
$573M
| $150K | ﹤0.01% |
95
+61
| +179% | +$1.16K |
|
|
SEMG
3872
CALL
DELISTED
SEMGROUP CORPORATION
SEMG
| $150K | ﹤0.01% |
92
+76
| +475% | +$888 |
|
3873
CALL
DMC Global
BOOM
$111M
| $149K | ﹤0.01% |
34
-86
| -72% | -$4.32K |
|
|
BPT
3874
CALL
DELISTED
BP Prudhoe Bay Royalty Trust
BPT
| $149K | ﹤0.01% |
163
-12
| -7% | -$124 |
|
|
CPRX
3875
PUT
DELISTED
Catalyst Pharmaceutical
CPRX
| $149K | ﹤0.01% |
282
-211
| -43% | -$1.12K |
|
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.