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 | |
|---|---|---|---|---|---|---|
2676
National Vision
EYE
$1.67B
| $473K | ﹤0.01% |
19,662
+12,906
| +191% | +$376K |
|
2677
CALL
Graphic Packaging
GPK
$3.33B
| $473K | ﹤0.01% |
321
+152
| +90% | +$2.13K |
|
2678
A.O. Smith
AOS
$8.6B
| $472K | ﹤0.01% |
+9,910
| New | +$458K |
|
2679
CALL
Helen of Troy
HELE
$666M
| $472K | ﹤0.01% |
30
-34
| -53% | -$5.05K |
|
2680
Celanese
CE
$4.88B
| $471K | ﹤0.01% |
+3,854
| New | +$434K |
|
2681
Hartford Financial Services
HIG
$38.5B
| $471K | ﹤0.01% |
+7,785
| New | +$456K |
|
2682
PUT
Raymond James Financial
RJF
$33.4B
| $470K | ﹤0.01% |
86
-408
| -83% | -$22.2K |
|
2683
CALL
TransUnion
TRU
$14.7B
| $470K | ﹤0.01% |
58
+37
| +176% | +$2.98K |
|
2684
KeyCorp
KEY
$24.2B
| $469K | ﹤0.01% |
26,328
+18,065
| +219% | +$313K |
|
2685
CALL
Supernus Pharmaceuticals
SUPN
$2.75B
| $469K | ﹤0.01% |
171
+167
| +4,175% | +$4.95K |
|
|
USCR
2686
CALL
DELISTED
U S Concrete, Inc.
USCR
| $469K | ﹤0.01% |
85
+15
| +21% | +$701 |
|
2687
PUT
Genuine Parts
GPC
$17.7B
| $468K | ﹤0.01% |
47
-151
| -76% | -$14.5K |
|
2688
Vanguard Total World Stock ETF
VT
$76.4B
| $468K | ﹤0.01% |
6,258
-6,061
| -49% | -$453K |
|
2689
CALL
Yext
YEXT
$550M
| $468K | ﹤0.01% |
295
+166
| +129% | +$3.16K |
|
2690
PUT
United Parks & Resorts
PRKS
$2.11B
| $468K | ﹤0.01% |
178
+137
| +334% | +$4.17K |
|
|
2691
United Parks & Resorts
PRKS
$2.11B
| $467K | ﹤0.01% |
17,763
-16,369
| -48% | -$498K |
|
2692
CALL
Atmos Energy
ATO
$29.8B
| $466K | ﹤0.01% |
41
+11
| +37% | +$1.2K |
|
2693
CALL
Dana Inc
DAN
$2.93B
| $466K | ﹤0.01% |
323
+74
| +30% | +$1.15K |
|
2694
Marvell Technology
MRVL
$170B
| $465K | ﹤0.01% |
18,634
+7,322
| +65% | +$184K |
|
|
CCMP
2695
PUT
DELISTED
CMC Materials, Inc. Common Stock
CCMP
| $465K | ﹤0.01% |
33
-2
| -6% | -$247 |
|
|
SGMO
2696
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
| $464K | ﹤0.01% |
51,289
+630
| +1% | +$7.07K |
|
2697
Western Union
WU
$2.55B
| $464K | ﹤0.01% |
+20,060
| New | +$433K |
|
2698
New Oriental
EDU
$7.92B
| $463K | ﹤0.01% |
+4,182
| New | +$438K |
|
2699
National Health Investors
NHI
$3.85B
| $463K | ﹤0.01% |
5,620
-298
| -5% | -$24.2K |
|
2700
Viking Therapeutics
VKTX
$4.15B
| $463K | ﹤0.01% |
67,411
+55,818
| +481% | +$415K |
|
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.