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 | |
|---|---|---|---|---|---|---|
|
WLL
2476
CALL
DELISTED
Whiting Petroleum Corporation
WLL
| $575K | ﹤0.01% |
10
-3
| -23% | -$2.54K |
|
2477
PUT
eHealth
EHTH
$43.8M
| $574K | ﹤0.01% |
86
-35
| -29% | -$3.16K |
|
2478
CALL
MGIC Investment
MTG
$6.34B
| $574K | ﹤0.01% |
457
+191
| +72% | +$2.47K |
|
2479
PUT
Ryder
R
$10.2B
| $574K | ﹤0.01% |
111
+73
| +192% | +$3.81K |
|
|
GRA
2480
CALL
DELISTED
W.R. Grace & Co.
GRA
| $574K | ﹤0.01% |
86
-39
| -31% | -$2.73K |
|
2481
CALL
Matsons
MATX
$6.24B
| $573K | ﹤0.01% |
153
+140
| +1,077% | +$5.32K |
|
2482
PUT
Tennant Co
TNC
$1.48B
| $572K | ﹤0.01% |
81
| – | – |
|
2483
PUT
Upwork
UPWK
$1.14B
| $572K | ﹤0.01% |
430
-281
| -40% | -$4.29K |
|
|
SHLX
2484
CALL
DELISTED
Shell Midstream Partners, L.P.
SHLX
| $572K | ﹤0.01% |
280
+28
| +11% | +$578 |
|
2485
Arista Networks
ANET
$211B
| $571K | ﹤0.01% |
+38,272
| New | +$592K |
|
2486
CALL
Bruker
BRKR
$9.25B
| $571K | ﹤0.01% |
130
+84
| +183% | +$3.76K |
|
2487
Burlington
BURL
$22.3B
| $571K | ﹤0.01% |
2,859
+1,996
| +231% | +$367K |
|
2488
PUT
Winnebago Industries
WGO
$883M
| $571K | ﹤0.01% |
149
+89
| +148% | +$3.24K |
|
2489
Quest Diagnostics
DGX
$25.3B
| $569K | ﹤0.01% |
+5,324
| New | +$547K |
|
2490
Annaly Capital Management
NLY
$17B
| $569K | ﹤0.01% |
16,191
+6,920
| +75% | +$249K |
|
|
HA
2491
CALL
DELISTED
Hawaiian Holdings, Inc.
HA
| $569K | ﹤0.01% |
217
-18
| -8% | -$473 |
|
2492
PUT
Green Dot
GDOT
$750M
| $568K | ﹤0.01% |
225
-539
| -71% | -$19.9K |
|
2493
CALL
Autoliv
ALV
$8.63B
| $567K | ﹤0.01% |
72
+58
| +414% | +$4.13K |
|
|
AXON
2494
PUT
Axon Enterprise
AXON
$41.9B
| $567K | ﹤0.01% |
100
-61
| -38% | -$3.85K |
|
|
EV
2495
CALL
DELISTED
Eaton Vance Corp.
EV
| $566K | ﹤0.01% |
126
+12
| +11% | +$519 |
|
2496
CALL
Rambus
RMBS
$10.2B
| $565K | ﹤0.01% |
431
-267
| -38% | -$3.35K |
|
2497
CALL
Tanger
SKT
$4.82B
| $565K | ﹤0.01% |
365
+109
| +43% | +$1.71K |
|
2498
CALL
City Holding Co
CHCO
$1.99B
| $564K | ﹤0.01% |
74
-1
| -1% | -$75 |
|
|
RDFN
2499
CALL
DELISTED
Redfin
RDFN
| $564K | ﹤0.01% |
335
+216
| +182% | +$3.81K |
|
2500
Supernus Pharmaceuticals
SUPN
$2.77B
| $564K | ﹤0.01% |
20,545
+13,679
| +199% | +$405K |
|
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.